OYO GEOSPACE CORP
S-1/A, 1997-11-18
MEASURING & CONTROLLING DEVICES, NEC
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 18, 1997
    
 
                                                      REGISTRATION NO. 333-36727
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
   
                                AMENDMENT NO. 2
    
                                       TO
                                    FORM S-1
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                            OYO GEOSPACE CORPORATION
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<C>                                    <C>                                    <C>
              DELAWARE                                 3829                                76-0447780
   (State or other jurisdiction of         (Primary Standard Industrial                 (I.R.S. Employer
   incorporation or organization)           Classification Code Number)                Identification No.)
</TABLE>
 
                              7334 N. GESSNER ROAD
                              HOUSTON, TEXAS 77040
                                 (713) 939-9700
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
 
                                 GARY D. OWENS
                            OYO GEOSPACE CORPORATION
                              7334 N. GESSNER ROAD
                              HOUSTON, TEXAS 77040
                                 (713) 939-9700
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                                   COPIES TO:
 
<TABLE>
<C>                                                    <C>
                  CHARLES H. STILL                                         T. MARK KELLY
             FULBRIGHT & JAWORSKI L.L.P.                              VINSON & ELKINS L.L.P.
              1301 MCKINNEY, SUITE 5100                               1001 FANNIN, SUITE 2300
              HOUSTON, TEXAS 77010-3095                              HOUSTON, TEXAS 77002-6760
                   (713) 651-5151                                         (713) 758-2222
</TABLE>
 
   
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
    
 
   
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
    
 
   
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
    
   
- ---------------
    
 
   
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
    
   
- ---------------
    
 
   
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
    
   
                             ---------------------
    
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
================================================================================
<PAGE>   2
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
   
                 SUBJECT TO COMPLETION, DATED NOVEMBER 18, 1997
    
 
PROSPECTUS
 
                                2,000,000 SHARES
 
                              [OYO GEOSPACE LOGO]
 
                                  COMMON STOCK
                            ------------------------
 
     Of the 2,000,000 shares of common stock, par value $.01 per share (the
"Common Stock"), of OYO Geospace Corporation ("OYO Geospace" or the "Company")
offered hereby (the "Offering"), 1,000,000 are being sold by the Company and
1,000,000 are being sold by OYO Corporation U.S.A. ("OYO U.S.A." or the "Selling
Stockholder"). The Company will not receive any proceeds from the shares of
Common Stock sold by the Selling Stockholder. See "Selling Stockholder."
 
     Prior to the Offering, there has been no public market for the Common
Stock. It is currently estimated that the initial public offering price will be
between $12 and $14 per share. See "Underwriting." The Common Stock has been
approved for listing and quotation of the Shares on the Nasdaq National Market
under the symbol "OYOG."
 
      SEE "RISK FACTORS" BEGINNING ON PAGE 8 FOR A DISCUSSION OF CERTAIN FACTORS
THAT SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE COMMON STOCK OFFERED
HEREBY.
                            ------------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
=============================================================================================================
                                                                                               PROCEEDS
                                                 UNDERWRITING            PROCEEDS               TO THE
                               PRICE            DISCOUNTS AND             TO THE               SELLING
                             TO PUBLIC          COMMISSIONS(1)          COMPANY(2)          STOCKHOLDER(2)
- -------------------------------------------------------------------------------------------------------------
<S>                     <C>                  <C>                   <C>                   <C>
Per Share.............           $                    $                     $                     $
- -------------------------------------------------------------------------------------------------------------
Total (3).............           $                    $                     $                     $
=============================================================================================================
</TABLE>
 
(1) The Company and the Selling Stockholder have agreed to indemnify the several
    Underwriters against certain liabilities, including liabilities under the
    Securities Act of 1933. See "Underwriting."
 
(2) Before deducting expenses payable proportionately by the Company and the
    Selling Stockholder estimated to be $500,000.
 
(3) Each of the Company and the Selling Stockholder has granted the Underwriters
    a 30-day option to purchase up to an additional 150,000 shares of Common
    Stock (aggregate of 300,000 shares) on the same terms and conditions as set
    forth above solely to cover over-allotments, if any. If the Underwriters
    exercise such option in full, the Price to Public, Underwriting Discounts
    and Commissions, Proceeds to the Company and Proceeds to the Selling
    Stockholder, before deducting expenses, will be $          , $          ,
    $          and $          , respectively. See "Underwriting."
                            ------------------------
 
     The shares of Common Stock are offered severally by the Underwriters named
herein subject to prior sale, when, as and if delivered to and accepted by the
Underwriters subject to their right to reject any order in whole or in part, and
subject to certain other conditions. It is expected that delivery of the shares
of Common Stock will be made at the offices of Rauscher Pierce Refsnes, Inc.,
Dallas, Texas, on or about             , 1997.
RAUSCHER PIERCE REFSNES, INC.
                                  RAYMOND JAMES & ASSOCIATES, INC.
                            ------------------------
 
               THE DATE OF THIS PROSPECTUS IS             , 1997.
<PAGE>   3
 
                               (PRODUCT PICTURES)
 
     CERTAIN PERSONS PARTICIPATING IN THE OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK,
INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN SUCH
COMMON STOCK, AND THE IMPOSITION OF A PENALTY BID, IN CONNECTION WITH THE
OFFERING. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and Consolidated Financial Statements, including the Notes thereto,
appearing elsewhere in this Prospectus. Unless otherwise indicated, the
information in this Prospectus gives effect to a 4,000-for-one exchange of the
Common Stock (the "Stock Split"), effected September 30, 1997 in contemplation
of the Offering. Unless otherwise indicated, the information in this Prospectus
assumes that the Underwriters' over-allotment option will not be exercised.
Unless the context indicates otherwise, all references to the "Company" or "OYO
Geospace" refer to OYO Geospace Corporation, a Delaware corporation, and its
subsidiaries and predecessor entities. Certain seismic and technical terms used
in this Prospectus are defined in the "Glossary" appearing elsewhere herein.
 
                                  THE COMPANY
GENERAL
 
     OYO Geospace Corporation designs and manufactures instruments and equipment
used in the acquisition and processing of seismic data. The Company has been in
the seismic instrument and equipment business since 1980, and markets its
products primarily to the oil and gas industry worldwide. The Company's product
lines currently include geophones and hydrophones, seismic leader wire, geophone
string connectors, thermal imaging products and small data acquisition systems
targeted at niche markets. The Company's products are compatible with most major
seismic data acquisition systems currently in use, and sales result primarily
from seismic contractors purchasing the Company's products as peripheral
components of new data acquisition systems or to replace or upgrade peripheral
components of data acquisition systems already in use. The Company believes that
its products are among the most technologically advanced instruments and
equipment available for seismic data acquisition.
 
     The Company has recently introduced a line of high resolution, wide format
thermal plotters for use in the commercial graphics industry. This product line
is an outgrowth of its seismic thermal imaging product line. In addition, OYO
Geospace plans to expand its product lines with the commencement of seismic
telemetric cable manufacturing in fiscal 1998. The Company has begun producing
and testing seismic telemetric cable, and these products are in the final stages
of development. The Company also plans to expand its product lines further
through research and development and through selective acquisitions, focusing in
the areas of (i) seismic instruments and equipment used in time lapse 3-D
seismic data acquisition (the acquisition of 3-D seismic data repeated in the
same area over time in order to track fluid movement in a reservoir), (ii)
three-axis seismic data acquisition (the acquisition of seismic data on three
axes to determine rock properties and fluid types) and (iii) borehole seismology
(the process of generating and/or recording seismic waves in existing well
bores).
 
PRODUCTS
 
     The Company designs, manufactures and markets geophones and hydrophones.
Geophones are seismic sensor devices that detect energy from the earth's
subsurface. The Company's GS-20DX geophone, which the Company still manufactures
and sells, historically was the Company's standard geophone. Since 1992, the
Company has introduced the more advanced GS-30CT and GS-32CT geophones, which
provide greater geophone-to-geophone uniformity, lower signal distortion and
substantially tighter tolerances on key geophone parameters. This improved
signal quality allows customers to take full advantage of the capabilities of
24-bit 3-D seismic data acquisition systems. Hydrophones are seismic sensors
that respond to changes in pressure associated with a seismic signal and are
used to acquire seismic data in water. The Company manufactures a line of
hydrophones for use primarily in swamps, rivers, bays and transition zones.
 
     The Company also designs and manufactures multi-strand seismic leader wire
(composed of up to four wire strands) used to construct geophone and hydrophone
strings and designs, manufactures and markets geophone and hydrophone string
connectors used to connect geophone or hydrophone strings to a seismic data
collection unit.
                                        3
<PAGE>   5
 
     In addition, the Company designs, manufactures and markets two lines of
seismic products based on thermal imaging technology: (i) a line of digital
field monitors, sometimes referred to in the seismic industry as "field
cameras," which are used to display seismic data during the recording process to
assure quality control, and (ii) a line of seismic plotters employed in
connection with seismic data processing. The Company believes that it is the
leading manufacturer of thermal plotters for the seismic industry. As an
outgrowth of its seismic thermal imaging product line, the Company has developed
wide format 400 dots-per-inch ("dpi") and 600 dpi thermal plotters for use in
the commercial graphics industry. Such commercial graphics applications include
the newsprint, screen print and corrugated print industries. The Company
believes that it is the only manufacturer of wide format 600 dpi thermal
plotters for use in commercial graphics applications.
 
SEISMIC INDUSTRY OVERVIEW
 
     Seismic data is the principal source of information used by geoscientists
to map potential or existing oil and gas bearing formations and the geologic
structures that surround them. Seismic data is used primarily in connection with
the exploration, development and production of oil and gas. The process of
seismic data acquisition is conducted in several stages. First, an energy source
imparts seismic waves into the earth, reflections of which are received and
measured by geophones and hydrophones. Electrical signals generated by the
geophones and hydrophones are then transmitted through leader wire, geophone and
hydrophone string connectors and telemetric cable to data collection units,
which store information for processing and analysis.
 
     The Company believes that several important trends have impacted the
seismic industry in recent years and will have positive effects on the Company's
business. First, the outsourcing of seismic instrument and equipment
manufacturing operations by large geophysical contractors has substantially
increased the Company's universe of potential customers. Second, one of the
primary advancements in the 3-D seismic data acquisition process has been the
trend toward larger and higher resolution surveys, requiring higher channel
counts and resulting in the use of more geophones, hydrophones, leader wire,
connectors and telemetric cable. Third, the increased size and expense of
seismic surveys has caused a continuing consolidation of geophysical contractors
resulting in a number of larger, better capitalized contractors that utilize
greater quantities of sophisticated seismic instruments and equipment. Finally,
declining computing equipment costs are making 3-D seismic technology available
to a larger number of independent oil and gas companies, improving demand for
3-D seismic surveys and seismic instruments and equipment.
 
NEW SENIOR MANAGEMENT
 
     To position OYO Geospace for increased growth, the Company recently hired a
new senior management team headed by Gary D. Owens, Chairman of the Board,
President and Chief Executive Officer. Prior to joining OYO Geospace in August
1997, Mr. Owens served in various positions with Input/Output, Inc.
("Input/Output"), a leading manufacturer of seismic data acquisition systems and
related equipment, from 1977 to May 1997, most recently as President and Chief
Executive Officer. Other recent additions to the Company's senior management
team include Michael J. Sheen, Vice President and Chief Technical Officer, and
Thomas T. McEntire, Chief Financial Officer. Mr. Sheen served in various
positions at Input/Output from 1977 to June 1997, most recently as Senior Vice
President and Chief Technical Officer. Mr. McEntire served in senior financial
positions for APS Holding Corporation, a nationwide distributor of automotive
parts and accessories, from 1990 to September 1997, most recently as Financial
Controller.
                                        4
<PAGE>   6
 
BUSINESS STRATEGY
 
     The Company's new senior management team has developed a business strategy
designed to accelerate the Company's rate of growth. Pursuant to this strategy,
the Company will seek to:
 
      - Significantly Expand Manufacturing Capacity of Existing Products -- The
        Company plans to commence a 45,000 square foot expansion of one of the
        Company's Houston-based manufacturing facilities in the first quarter of
        fiscal 1998. Planned for completion in the third quarter of fiscal 1998,
        the expansion will significantly increase the Company's geophone,
        hydrophone and multi-strand leader wire manufacturing capacity.
 
      - Expand Product Lines -- In fiscal 1998, the Company intends to construct
        or lease additional facilities to diversify its manufacturing capability
        to include five-strand leader wire and telemetric cable used in the land
        and marine seismic data acquisition markets.
 
      - Increase Research and Development Investment -- During fiscal years 1995
        through 1997, the Company's research and development investment averaged
        $2.1 million per annum or 6.1% of revenues. Management intends to
        increase such expenditures gradually in future periods, with an emphasis
        on the development of new technologies to serve the rapidly emerging
        markets for time lapse 3-D seismic data acquisition, three-axis seismic
        data acquisition and borehole seismology surveys.
 
      - Continue to Develop Non-Seismic Markets for the Company's
        Technologies -- OYO Geospace has committed significant resources to
        adapt the Company's thermal imaging products for use in commercial
        graphics applications. Management believes that the development of
        additional non-seismic applications for its technologies will diversify
        the Company's revenue base and expose the Company to larger markets.
 
      - Selectively Pursue Niche Acquisitions -- Management intends to
        supplement the Company's internal growth through the acquisition of
        manufacturers of seismic-related products. While the seismic equipment
        industry has undergone consolidation in recent years, the industry
        continues to be populated by numerous niche manufacturers, certain of
        which may become available for acquisition by the Company. However, OYO
        Geospace is not presently in discussions with any potential acquisition
        candidates, and no assurances can be made that any acquisitions will be
        available to the Company on attractive terms.
 
                               THE PARENT COMPANY
 
     The Company currently is a wholly-owned indirect subsidiary of OYO
Corporation, a Japanese public company ("OYO Japan") established in 1957 and
engaged in the business of providing geo-engineering and consulting services
primarily for geological analysis of the earth's subsurface for construction
projects. The Company has historically benefited from its relationship with OYO
Japan through financial support, a favorable supply contract and shared
technological resources. The Company expects the supply contract and, to the
extent relevant, shared technology with OYO Japan to continue upon consummation
of the Offering; however, the Company anticipates that it will not rely on OYO
Japan for financial support. Upon completion of the Offering, OYO Japan will own
indirectly approximately 59% of the outstanding Common Stock through its
wholly-owned subsidiary, OYO U.S.A.
 
     The Company's principal executive offices are located at 7334 North Gessner
Road, Houston, Texas 77040, and its telephone number is (713) 939-9700.
                                        5
<PAGE>   7
 
                                  THE OFFERING
 
Common Stock offered by the
Company.............................     1,000,000 shares
 
Common Stock offered by Selling
  Stockholder(1)....................     1,000,000 shares
 
   
Common Stock to be outstanding after
the Offering(2).....................     5,068,000 shares
    
 
Use of proceeds.....................     To expand the Company's existing
                                         manufacturing facilities, construct,
                                         lease or purchase additional facilities
                                         to expand product lines, repay certain
                                         short-term indebtedness and for general
                                         corporate purposes. See "Use of
                                         Proceeds."
 
Nasdaq National Market Symbol.......     OYOG
- ---------------
 
(1) The Company will not receive any proceeds from the sale of Common Stock by
    OYO U.S.A. See "Selling Stockholder."
 
   
(2) Includes an aggregate of 68,000 shares of restricted stock to be granted to
    certain key employees in connection with the Offering pursuant to the
    Company's 1997 Key Employee Stock Option Plan. Does not include an aggregate
    of 432,000 additional shares reserved for issuance pursuant to that plan and
    the Company's 1997 Non-Employee Director Plan, of which options to purchase
    an aggregate of 187,000 shares are to be issued at the closing of the
    Offering. See "Management -- Key Employee Stock Option Plan."
    
                                        6
<PAGE>   8
 
                             SUMMARY FINANCIAL DATA
 
   
<TABLE>
<CAPTION>
                                                                   YEAR ENDED SEPTEMBER 30,
                                                              -----------------------------------
                                                                1995         1996         1997
                                                              ---------    ---------    ---------
                                                                (IN THOUSANDS, EXCEPT SHARE AND
                                                                      PER SHARE AMOUNTS)
<S>                                                           <C>          <C>          <C>
STATEMENT OF OPERATIONS DATA:
Sales.......................................................  $  32,615    $  30,878    $  41,049
Cost of sales...............................................     18,909       17,278       24,239
                                                              ---------    ---------    ---------
Gross profit................................................     13,706       13,600       16,810
Operating expenses:
  Selling, general and administrative.......................      5,854        6,729        8,084
  Research and development..................................      1,988        1,959        2,392
  Bad debt expense (recovery)(1)............................      1,013        2,860       (4,228)
                                                              ---------    ---------    ---------
Total operating expenses....................................      8,855       11,548        6,248
                                                              ---------    ---------    ---------
Net income from operations..................................      4,851        2,052       10,562
Other income (expense), net.................................       (931)        (466)          63
                                                              ---------    ---------    ---------
Income before income taxes..................................      3,920        1,586       10,625
Provision for income taxes..................................      1,579          577        4,003
                                                              ---------    ---------    ---------
Net income..................................................  $   2,341    $   1,009    $   6,622
                                                              =========    =========    =========
Net income per share........................................  $     .59    $     .25    $    1.66
                                                              =========    =========    =========
Weighted average shares outstanding as restated for stock
  split.....................................................  4,000,000    4,000,000    4,000,000
CASH FLOW DATA:
Net cash provided by operating activities...................  $     809    $     485    $   9,998
Net cash used in investing activities.......................     (1,066)      (1,944)      (5,602)
Net cash provided by (used in) financing activities.........        332        1,211       (2,671)
OTHER FINANCIAL DATA:
Depreciation and amortization...............................  $     891    $   1,025    $   1,470
EBITDA(2)...................................................      5,263        3,013       12,701
Capital expenditures........................................      1,391        2,063        6,396
</TABLE>
    
 
<TABLE>
<CAPTION>
                                                                AS OF SEPTEMBER 30, 1997
                                                              ----------------------------
                                                              HISTORICAL    AS ADJUSTED(3)
                                                              ----------    --------------
                                                                     (IN THOUSANDS)
<S>                                                           <C>           <C>
BALANCE SHEET DATA:
Working capital.............................................   $16,140         $27,980
Total assets................................................    35,078          45,418
Short-term debt.............................................     1,500              --
Stockholders' equity........................................    25,100          36,940
</TABLE>
 
   
- ---------------
    
 
(1) Includes $2.8 million in the year ended September 30, 1996, reflecting a
    provision for loss on notes receivable from Grant Geophysical, Inc.
    ("Grant"), thereby reducing the carrying balance of such notes to zero. The
    total amount of indebtedness on such notes as of September 26, 1997,
    including accrued interest, was $6.8 million. On September 26, 1997, the
    Company received $6.2 million in conjunction with such notes and related
    interest income, resulting in a recovery, net of $1.0 million in purchase
    credit concessions, of $5.2 million (including interest of $0.8 million).
    See "Management's Discussion and Analysis of Financial Condition and Results
    of Operations -- Liquidity and Capital Resources" and Note 4 to the Notes to
    the Consolidated Financial Statements contained elsewhere in this
    Prospectus.
 
   
(2) EBITDA is defined as earnings before interest, income taxes, depreciation
    and amortization. EBITDA is not a measure of cash flow as determined by
    generally accepted accounting principles ("GAAP"). EBITDA should not be
    considered as an alternative to, or more meaningful than, net income or cash
    flow as determined in accordance with GAAP or as an indicator of the
    Company's operating performance or liquidity. Certain items excluded from
    EBITDA are significant components in understanding and assessing the
    Company's financial performance, such as a Company's cost of capital and tax
    structure, as well as historic costs of depreciable assets, none of which
    are components of EBITDA. The Company's computation of EBITDA may not be
    comparable to other similarly titled measures of other companies. The
    Company believes that EBITDA is a measure of operating performance followed
    by securities analysts and may also be used by investors to measure the
    Company's ability to meet future debt service requirements, if any.
    Management believes EBITDA provides useful supplemental information about
    the Company's operations because it provides a measure of a company's
    ability to service any debt incurred.
    
 
(3) As adjusted to reflect the Offering and the application of the net proceeds
    therefrom (based on an assumed initial public offering price of $13 per
    share).
                                        7
<PAGE>   9
 
                                  RISK FACTORS
 
     Prospective purchasers of the Common Stock offered hereby should consider
carefully the following factors in evaluating an investment in the Common Stock.
Statements made in this Prospectus that are not historical facts are
forward-looking statements. Such statements include those relating to the
Company's future plans and expected events, outcomes and results. Although the
Company believes it has a reasonable basis for each such statement, such
statements are by their nature subject to risks and uncertainties, including
those described below, and the Company cannot and does not provide any assurance
as to such plans or expected events, outcomes or results. Prospective purchasers
should therefore exercise caution in making an investment decision.
 
VOLATILITY OF OIL AND GAS EXPLORATION ACTIVITY
 
     Demand for the Company's products is dependent primarily upon the level of
worldwide oil and gas exploration activity. That activity, in turn, is dependent
primarily upon prevailing oil and gas prices. Historically, the markets for oil
and gas have been volatile, and such markets are likely to continue to be
volatile. Oil and gas prices are subject to wide fluctuation in response to
relatively minor changes in the supply of and demand for oil and gas, market
uncertainty and a variety of additional factors that are beyond the control of
the Company. These factors include the level of consumer product demand, weather
conditions, domestic and foreign governmental regulations, the price and
availability of alternative fuels, political conditions in the Middle East, the
foreign supply of oil and gas, the price of foreign imports and overall economic
conditions. It is impossible to predict future oil and gas price movements with
certainty. Accordingly, no assurance can be given as to the level of future
demand for the Company's products. See "Business -- Seismic Industry Overview."
 
RAPID TECHNOLOGICAL EVOLUTION AND PRODUCT OBSOLESCENCE
 
     The markets for seismic instruments and equipment are characterized by
continual and rapid technological developments that have resulted in, and will
likely continue to result in, substantial improvements in product function and
performance. The Company believes that its future success is dependent upon its
ability to continue to (i) improve its existing product lines, (ii) address the
increasingly sophisticated needs of its customers, (iii) maintain a reputation
for technological leadership and (iv) maintain market acceptance. The Company
also believes that its success will depend on its ability to anticipate changes
in technology and industry standards and to respond to technological
developments on a timely basis, either internally or through strategic
alliances. Current competitors or new market entrants may develop new
technologies, products or standards that could render the Company's products
obsolete. There can be no assurance that the Company will be successful in
developing and marketing, on a timely and cost effective basis, product
enhancements or new products that respond to technological developments, that
are accepted in the marketplace or that comply with industry standards.
 
HIGHLY COMPETITIVE MARKETS
 
     The markets for the Company's products are highly competitive and
characterized by continual and rapid changes in technology. Many of the
Company's existing and potential competitors have substantially greater
marketing, financial and technical resources than the Company. Additionally, one
of the Company's competitors currently offers a broader range of seismic
instruments and equipment for sale and markets this equipment as a "packaged"
data acquisition system. The Company does not now offer for sale such a complete
"packaged" data acquisition system. Further, certain of the Company's
competitors offer financing arrangements to customers on terms that the Company
may not be able to match. In addition, new competitors may enter the market and
competition could intensify. For example, a former joint venture partner of the
Company in the People's Republic of China is capable of manufacturing a geophone
similar to the Company's older model geophone, the GS-20DX, and, since such
venture has now been terminated by mutual agreement, may attempt to market such
geophone outside of China and in competition with the Company. There can be no
assurance that sales of the Company's products will continue at current volumes
or prices if its current competitors or new market entrants introduce new
products with better features, performance, price or other characteristics than
the Company's products. Competitive pressures or other factors also may result
in
 
                                        8
<PAGE>   10
 
significant price competition that could have a material adverse effect on the
Company's results of operations. See "Business -- Products and Competition."
 
LIMITATIONS ON PRODUCTION CAPACITY; INCREASED DELIVERY TIMES
 
     The Company's production capacity and ability to fill orders for its
products timely is limited by its equipment, the size of its production
facilities and its human resources. These resources are in turn restricted by
the availability of the capital and time required to increase capacity,
particularly to construct or build out additional facilities. Although the
Company strives to fill orders for its products within 60 days of the date they
are received, in recent months the Company has taken 90 days or longer to
deliver on certain orders due to its limited capacity to meet an increased
number and size of orders. There can be no assurance that the Company will have
sufficient capital and resources to expand its production capacity and return
its delivery times to levels it considers appropriate. Further, the Company's
current increased delivery times may result in a loss of the Company's
customers. Finally, if the Company is able to increase its production capacity,
there can be no assurance that demand for its products will remain sufficiently
high for it to realize an appropriate return on the capital expended to increase
capacity. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources."
 
LIMITED MARKET AND CUSTOMER CONCENTRATION
 
     The Company markets its products to seismic contractors and large,
independent and government-owned oil and gas companies. The Company estimates,
based on published industry sources, that fewer than 100 seismic contracting
companies are currently operating worldwide (excluding those operating in Russia
and the former Soviet Union, India, the People's Republic of China and certain
Eastern European countries, where seismic data acquisition activity is difficult
to verify). Partly as a result of these market factors, a relatively small
number of customers has accounted for most of the Company's sales. The loss of
certain customers would be material to the Company's sales. See
"Business -- Products and Competition" and "Business -- Markets and Customers."
 
FLUCTUATIONS IN QUARTERLY PERFORMANCE
 
     Historically, the rate of new orders for the Company's products has varied
substantially from quarter to quarter. Moreover, the Company typically operates
and expects to continue to operate on the basis of orders in hand for its
products before commencing substantial manufacturing "runs"; hence the timing of
orders can significantly impact the operating results and cash flow for any
quarter and can further adversely impact the Company's manufacturing capability
and expense levels. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Results of Operations."
 
CREDIT RISKS OF CUSTOMER FINANCING
 
     The Company has in the past incurred significant write-offs in its accounts
receivables due to customer credit problems. The Company is subject to special
credit risks as to certain of its customers, as the Company has found it
necessary from time to time to extend trade credit to long-term customers and
others where some risks of nonpayment or late payment exist. There can be no
assurances that sufficient aggregate amounts of uncollectible receivables and
bad debt write-offs will not have a material adverse effect on the Company's
results of operations in the future. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations -- Liquidity and Capital
Resources," "Business -- Markets and Customers" and Note 4 of Notes to
Consolidated Financial Statements.
 
UNCERTAINTY OF PATENT PROTECTION
 
     The Company has applied for and holds certain patents relating to its
seismic data acquisition and other products. There is no assurance that the
Company's patents will prove enforceable, that any patents will be issued for
which application has been made or that competitors will not develop
functionally similar
 
                                        9
<PAGE>   11
 
technology outside the protection of any patents the Company has or may obtain.
See "Business -- Intellectual Property."
 
RISKS AND DIFFICULTIES OF FOREIGN MARKETING
 
     The Company's sales by its foreign subsidiaries accounted for approximately
17% of the Company's sales during each of fiscal 1996 and 1997. Additionally,
the Company's United States subsidiaries engage in some export sales.
Substantially all of the Company's sales from the United States are made in U.S.
dollars, but from time to time the Company may make sales in foreign currencies
and may, therefore, be subject to foreign currency fluctuations on its sales. In
addition, net assets reflected on the balance sheet of the Company's Canadian
subsidiary are subject to currency fluctuations. Foreign sales are subject to
special risks inherent in doing business outside of the United States, including
the risk of war, civil disturbances, embargo and government activities, all of
which may disrupt markets. Foreign sales are also generally subject to the risk
of compliance with additional laws, including tariff regulations and import and
export restrictions. Sales in certain foreign countries require prior United
States government approval in the form of an export license. There can be no
assurance that the Company will not experience difficulties in connection with
future foreign sales.
 
RELIANCE ON SINGLE SUPPLIER AS TO ONE PRODUCT AND ON OTHER VENDORS
 
     Most of the Company's products incorporate certain products or technology
supplied in part by third parties. To the extent the Company experiences any
significant supply or quality control problems with its vendors, such problems
could have a significant adverse effect on the Company's ability to meet future
production and sales commitments.
 
     Currently, a single, unaffiliated Japanese company is the sole supplier of
a key component of the Company's line of wide-format thermal plotters. Because
of its historic relationship with this supplier, OYO Japan purchases this
component from this supplier and resells it to the Company. If the Company were
unable to obtain adequate supplies of these components from this supplier, the
Company could experience delays or reductions in production and increased
expenses while the Company redesigns its thermal plotters, all of which could
have an adverse effect on the financial performance of the Company. If the
Company were unable to identify an alternative source to this supplier or to
redesign its thermal plotter to utilize a different component without diminution
in product performance, the Company's ability to compete in the wide-body
thermal plotter market could be significantly affected. In addition, payments
for the component are required to be made in Japanese yen. Accordingly, there
exists some risk of foreign currency fluctuation, which could increase the cost
to the Company of the component. For the foreseeable future, the aggregate
amount of such purchases are expected to be approximately $3.0 million per year.
See "Business -- Suppliers" and "Relationship with OYO Japan and Related
Transactions."
 
FUTURE UNAVAILABILITY OF HISTORICAL SOURCES OF FINANCING
 
     Prior to the Offering, the Company has been operated as an indirect
wholly-owned subsidiary of OYO Japan and has relied on the financial support of
OYO Japan to assist in financing its acquisitions and operations. After the
Offering it is anticipated that the Company will not rely on OYO Japan for
financial support. No assurance can be given that additional financing will not
be required or that, if required, it will be available to the Company on
economically acceptable terms. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Liquidity and Capital
Resources."
 
CONTROL BY PRINCIPAL STOCKHOLDER
 
   
     Upon completion of the Offering, OYO Japan will own indirectly in the
aggregate approximately 59% of the outstanding Common Stock (55% if the
Underwriters' over-allotment option is exercised in full). Accordingly, OYO
Japan, through its wholly-owned subsidiary OYO U.S.A., will be able to elect all
of the directors of the Company and to control the Company's management,
operations and affairs. See "Security Ownership of Management and Principal
Stockholder." The Company currently has, and will continue to have, a variety of
contractual relationships with OYO Japan and its affiliates. See "Relationship
With OYO Japan and Related Transactions."
    
 
                                       10
<PAGE>   12
 
UNCERTAINTY OF ACQUISITION STRATEGY
 
     The Company anticipates that it will selectively pursue acquisitions of
manufacturers of seismic-related products. Nevertheless, there can be no
assurance that attractive acquisitions will be available to the Company at
reasonable prices or that any completed acquisition will ultimately prove to be
a successful undertaking by the Company.
 
DEPENDENCE UPON KEY PERSONNEL
 
   
     The Company believes that its success is dependent upon attracting and
retaining highly skilled professionals. A number of the Company's employees are
highly skilled engineers and other professionals, and the failure of the Company
to continue to attract and retain such professionals could adversely affect the
Company's continued ability to compete in the industry. In addition, the Company
believes that its success will depend to a significant extent upon the abilities
and efforts of several new members of its senior management who joined the
Company subsequent to August 1997, one of whom is the President and Chief
Executive Officer of the Company. See "Management." For information concerning
certain allegations made by the former employer of two members of this new
management team, See "Business -- Legal Proceedings."
    
 
HISTORICAL ABSENCE OF PUBLIC MARKET
 
     Prior to the Offering, there has been no public market for the Common
Stock. Although application has been made for inclusion of the Common Stock on
the Nasdaq National Market, there can be no assurance that an active trading
market will develop, or, if developed, will continue upon completion of the
Offering. The initial public offering price of the Common Stock will be
determined by negotiations between the Company and the Underwriters and may not
be indicative of the market price of the Common Stock after the Offering. For a
discussion of the factors to be considered in determining the initial public
offering price, see "Underwriting." The market price of the Common Stock could
be subject to significant fluctuations in response to variations in quarterly
and yearly operating results, the success of the Company's business strategy,
general trends in the oil and gas industry, competition, product obsolescence,
changes in federal regulations affecting the Company or the oil and gas industry
and other factors. In addition, the stock market in recent years has experienced
extreme price and volume fluctuations that have often been unrelated or
disproportionate to the operating performance of affected companies. These broad
fluctuations may adversely affect the market price of the Common Stock.
 
POSSIBLE ADVERSE EFFECT ON MARKET PRICE OF ANTI-TAKEOVER PROVISIONS
 
     OYO Geospace's Restated Certificate of Incorporation and Bylaws include a
number of provisions that may have the effect of encouraging persons considering
unsolicited tender offers or other unilateral takeover proposals to negotiate
with the Board of Directors rather than pursue non-negotiated takeover attempts.
These provisions may have the effect of delaying, deferring or preventing a
change in control of the Company whether or not such person chooses to negotiate
with the Board of Directors and may adversely affect the market price of the
Common Stock. The provisions include authorized blank check preferred stock, the
denial of the use of written consents, a classified Board of Directors and
restrictions on removal of directors. See "Description of Capital Stock."
 
POTENTIAL ADVERSE EFFECT ON MARKET PRICE OF SHARES ELIGIBLE FOR FUTURE SALE
 
   
     Immediately following the Offering, 5,068,000 shares of Common Stock will
be outstanding (5,218,000 shares if the Underwriters' over-allotment option is
exercised in full). In addition, an aggregate of 432,000 unissued shares have
been reserved for issuance pursuant to the Company's 1997 Key Employee Stock
Option Plan and 1997 Non-Employee Director Plan, of which options to purchase an
aggregate of 187,000 shares are to be issued at the closing of the Offering. The
Company intends to register the shares issuable under these plans pursuant to
the Securities Act. The 2,000,000 shares of Common Stock offered hereby,
together with any shares issued upon exercise of the Underwriters'
over-allotment option or under the Company's stock plans, will be eligible for
resale in the public market without restriction under the Securities
    
 
                                       11
<PAGE>   13
 
Act, except to the extent that those shares are acquired by affiliates of the
Company. All of the remaining outstanding shares of Common Stock will be subject
to resale in accordance with Rule 144 under the Securities Act. Sales of a
substantial number of shares of Common Stock may adversely affect the market
price of the Common Stock. See "Shares Eligible for Future Sale" and
"Underwriting."
 
IMMEDIATE AND SUBSTANTIAL DILUTION
 
     A purchaser of Common Stock in the Offering will experience an immediate
and substantial dilution in the net tangible book value of its shares of
approximately $5.81 per share. See "Dilution."
 
LACK OF DIVIDENDS
 
     The Company expects to retain cash generated from operations to support its
cash needs and does not anticipate the payment of any dividends on the Common
Stock for the foreseeable future. See "Dividend Policy."
 
                                       12
<PAGE>   14
 
                                  THE COMPANY
 
HISTORY
 
     OYO Japan first entered the North American market in 1980 with a start-up
geophone manufacturing business. Beginning in 1983, OYO Japan's North American
operations were conducted through a wholly-owned holding company, OYO U.S.A. In
1986, OYO U.S.A. acquired the geophone and hydrophone operations of AMF Geo
Space Corporation, a leading U.S. manufacturer of geophones. In 1988, these
acquired operations and the Company's separate geophone operations were merged
to form what is now Geo Space Corporation ("Geo Space"), a wholly-owned
subsidiary of the Company. Geo Space currently manufactures geophones and
hydrophones and related accessories such as geophone cases. OYO U.S.A. also
acquired from AMF in 1986 the nucleus of what is currently OYO Instruments, Inc.
("OYO Instruments"), another wholly-owned subsidiary of the Company. At the time
of its acquisition, OYO Instruments produced a single thermal plotter line. In
addition to an expanded line of thermal plotters, OYO Instruments also currently
manufactures and distributes other thermal display instruments, such as digital
field monitors and small data acquisition systems, and a line of high resolution
wide format thermal plotters for use in commercial graphics applications. In
1988, OYO U.S.A. acquired Houston Geophysical Products, Inc. ("HGPI").
 
     The Company was incorporated on September 27, 1994. The Company was
organized upon the contribution to it of all the outstanding shares of stock of
the subsidiaries of OYO U.S.A. that were engaged in seismic instrument and
equipment businesses and certain related assets and liabilities. In
contemplation of the Offering, the Company has recently undergone an internal
corporate restructuring to more fully separate itself from OYO Japan and OYO
U.S.A. See "Relationship with OYO Japan and Related Transactions." In preparing
its capital structure for the Offering, the Company effected the Stock Split.
References to "the Company" in this Prospectus relate to the business now
carried on by the Company and its subsidiaries and previously carried on by
their predecessors. The Company's principal executive offices are located at
7334 North Gessner Road, Houston, Texas 77040, and its telephone number is (713)
939-9700.
 
OYO JAPAN
 
     OYO Japan is principally engaged in providing geo-engineering and
consulting services in Japan and the Far East in connection with construction
projects. OYO Japan provides soil investigation, foundation investigation and
other engineering services, primarily in connection with the protection of
structures and facilities from earthquake damage or damage resulting from
underground soil conditions. See "Relationship With OYO Japan and Related
Transactions." As a result of the Offering, the Company will operate
independently of OYO Japan.
 
                                       13
<PAGE>   15
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the 1,000,000 shares of
Common Stock offered by the Company are estimated to be approximately $11.8
million (approximately $13.7 million if the Underwriters' over-allotment option
is exercised in full), assuming an initial public offering price of $13 per
share and after deducting the underwriting discounts and estimated expenses
payable by the Company.
 
     The Company intends to use approximately $3.0 million of the net proceeds
to fund a planned expansion of its primary manufacturing facility, $1.0 million
to construct, lease or purchase additional facilities and equipment to diversify
its manufacturing capability to include five-strand leader wire and telemetric
cable and $1.5 million to repay short-term debt. The Company intends to use the
remainder of the net proceeds to meet higher working capital requirements
associated with expanded capacity and new product lines, and for other general
corporate purposes, including potential acquisitions.
 
     All of the $1.5 million in short-term debt to be repaid from the net
proceeds of the Offering was incurred in connection with the purchase by the
Company of real properties from affiliates of OYO Japan in September 1997. This
debt bears interest at a variable LIBOR-based rate (6.2% as of October 31, 1997)
and matures on a rolling 30-day basis. The real properties purchased consist of
the Company's principal plants and certain adjacent properties. See
"Relationship With OYO Japan and Related Transactions."
 
     Pending the application of the net proceeds of the Offering, the Company
will invest the net proceeds in investment-grade, short-term, interest-bearing
securities.
 
     The Company believes that the combination of cash flow from operations,
credit facilities it expects to enter into and the net proceeds of the Offering
should provide the Company with sufficient capital resources and liquidity to
fund its operations for fiscal 1998 and support an acquisition and expansion
program and otherwise carry out the Company's business strategy as described
elsewhere in this Prospectus. However, there can be no assurance that the
Company will be able to obtain a credit facility on terms that it considers
reasonable or that, even if such a facility is effected, such sources of capital
will be sufficient to support an acquisition and expansion program in fiscal
1998 or in the long-term, and the Company may be required to issue additional
debt or equity securities in the future to meet its capital requirements. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
                                DIVIDEND POLICY
 
     The Company has not paid cash dividends since its formation and does not
anticipate that cash dividends will be paid in the foreseeable future since the
Company presently intends to retain any future earnings to finance the expansion
and continuing development of its business. The declaration and payment in the
future of any cash dividends will be at the election of the Company's Board of
Directors and will depend upon the earnings, capital requirements and financial
position of the Company, future loan covenants, general economic conditions and
other pertinent factors.
 
                                       14
<PAGE>   16
 
                                    DILUTION
 
     The net tangible book value of the Company at September 30, 1997, was $24.1
million, or $6.02 per share of Common Stock. After giving effect to the sale by
the Company of 1,000,000 of the Shares (at an assumed initial public offering
price of $13 per share and after deducting the underwriting discounts and
estimated offering expenses payable by the Company and the Selling Stockholder),
the net tangible book value at such date would have been $35.9 million, or $7.19
per share of Common Stock. This represents an immediate increase in net tangible
book value of $1.17 per share to OYO U.S.A. and an immediate dilution of $5.81
per share to investors purchasing shares in the Offering.
 
     The following table illustrates this dilution per share of Common Stock to
investors purchasing shares in the Offering:
 
<TABLE>
<S>                                                           <C>         <C>
Initial public offering price per share.....................               $13.00
  Net tangible book value per share as of September 30,
     1997...................................................   $6.02
  Increase per share attributable to the sale of shares
     offered hereby.........................................    1.17
                                                               -----
Pro forma net tangible book value per share after the
  Offering..................................................                 7.19
                                                                           ------
Dilution in net tangible book value per share to New
  Investors.................................................               $ 5.81
                                                                           ======
</TABLE>
 
                                 CAPITALIZATION
 
     The following table sets forth the capitalization of the Company as of
September 30, 1997, and as adjusted to reflect transactions as indicated. This
table should be read in conjunction with "Management's Discussion and Analysis
of Financial Condition and Results of Operations" and the Consolidated Financial
Statements (including the Notes thereto) included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                               AS OF SEPTEMBER 30, 1997
                                                              ---------------------------
                                                              HISTORICAL   AS ADJUSTED(1)
                                                              ----------   --------------
                                                              (IN THOUSANDS, EXCEPT SHARE
                                                                AND PER SHARE AMOUNTS)
<S>                                                           <C>          <C>
Short-term debt.............................................   $ 1,500        $    --
Stockholders' equity:
  Preferred stock, 1,000,000 shares authorized, no shares
     issued and outstanding.................................        --             --
  Common stock, $.01 par value, 20,000,000 shares
     authorized, 4,000,000 shares issued and outstanding
     (5,000,000 issued and outstanding as adjusted).........        40             50
  Additional paid-in capital................................     9,785         21,615
  Retained earnings.........................................    15,554         15,554
  Cumulative foreign currency translation adjustments.......      (279)          (279)
                                                               -------        -------
          Total stockholder's equity........................    25,100         36,940
                                                               -------        -------
          Total capitalization..............................   $25,100        $36,940
                                                               =======        =======
</TABLE>
 
- ---------------
 
(1) As adjusted to reflect the Offering and the application of the net proceeds
    therefrom (based on an assumed initial public offering price of $13 per
    share).
 
                                       15
<PAGE>   17
 
                            SELECTED FINANCIAL DATA
 
   
     The following selected consolidated financial data for each of the years in
the three-year period ended September 30, 1997 have been derived from audited
Consolidated Financial Statements of the Company. The Statement of Operations
Data for the years ended September 30, 1995, 1996 and 1997 and the Balance Sheet
as of September 30, 1996 and 1997 were derived from the Company's audited
Consolidated Financial Statements appearing elsewhere in this Prospectus. The
selected consolidated financial data shown below as of September 30, 1993 and
1994, and for the years then ended, are derived from unaudited Consolidated
Financial Statements of the Company. In the opinion of management of the
Company, such unaudited financial information includes all adjustments
(consisting of normal recurring accruals) considered necessary for a fair
presentation of the Company's results of operations for the periods then ended
and the Company's financial position as of such dates. This information should
be read in conjunction with "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the Consolidated Financial Statements
of the Company and the related Notes thereto included elsewhere in this
Prospectus.
    
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED SEPTEMBER 30,
                                         ------------------------------------------------------------------
                                            1993          1994          1995          1996          1997
                                         ----------    ----------    ----------    ----------    ----------
                                                 (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
<S>                                      <C>           <C>           <C>           <C>           <C>
STATEMENT OF OPERATIONS DATA:
Sales................................    $   18,649    $   29,072    $   32,615    $   30,878    $   41,049
Cost of sales........................        12,787        15,690        18,909        17,278        24,239
                                         ----------    ----------    ----------    ----------    ----------
Gross profit.........................         5,862        13,382        13,706        13,600        16,810
Operating expenses:
  Selling, general and
    administrative...................         5,179         6,035         5,854         6,729         8,084
  Research and development...........         1,582         1,697         1,988         1,959         2,392
  Bad debt expense (recovery)(1).....            --            73         1,013         2,860        (4,228)
  Write-down of investment in foreign
    joint venture....................            --         1,712            --            --            --
                                         ----------    ----------    ----------    ----------    ----------
         Total operating expenses....         6,761         9,517         8,855        11,548         6,248
                                         ----------    ----------    ----------    ----------    ----------
Income (loss) from operations........          (899)        3,865         4,851         2,052        10,562
Other income (expense), net..........          (300)          (95)         (931)         (466)           63
                                         ----------    ----------    ----------    ----------    ----------
Income (loss) before income taxes....        (1,199)        3,770         3,920         1,586        10,625
Provision (benefit) for income
  taxes..............................          (398)        1,487         1,579           577         4,003
                                         ----------    ----------    ----------    ----------    ----------
Net income (loss)....................    $     (801)   $    2,283    $    2,341    $    1,009    $    6,622
                                         ==========    ==========    ==========    ==========    ==========
Net income (loss) per share..........    $     (.20)   $      .57    $      .59    $      .25    $     1.66
                                         ==========    ==========    ==========    ==========    ==========
Weighted average shares outstanding
  as restated for stock split........     4,000,000     4,000,000     4,000,000     4,000,000     4,000,000
</TABLE>
 
<TABLE>
<CAPTION>
                                                                AS OF SEPTEMBER 30,
                                         ------------------------------------------------------------------
                                            1993          1994          1995          1996          1997
                                         ----------    ----------    ----------    ----------    ----------
                                                                   (IN THOUSANDS)
<S>                                      <C>           <C>           <C>           <C>           <C>
BALANCE SHEET DATA:
Working capital......................    $    8,883    $    6,099    $    9,266    $   10,718    $   16,140
Total assets.........................        19,373        19,208        24,259        26,272        35,078
Short-term debt, including current
  portion of long-term debt..........         1,187         2,779         2,932         3,124         1,500
Long-term debt.......................         8,799         8,140         7,818         7,919            --
Stockholder's equity.................         6,742         3,399         6,241         8,628        25,100
</TABLE>
 
- ---------------
 
(1) Includes $1.5 million in the year ended September 30, 1992 and $2.8 million
    in the year ended September 30, 1996, reflecting a provision for loss on
    notes receivable from Grant, thereby reducing the carrying balance of such
    notes to zero. The total amount of indebtedness on such notes as of
    September 26, 1997, including accrued interest, was $6.8 million. On
    September 26, 1997, the Company received $6.2 million in conjunction with
    such notes and related interest income, resulting in a recovery, net of $1.0
    million in purchase credit concessions, of $5.2 million. See "Management's
    Discussion and Analysis of Financial Condition and Results of
    Operations -- Liquidity and Capital Resources" and Note 4 to the Notes to
    the Consolidated Financial Statements contained elsewhere in this
    Prospectus.
 
                                       16
<PAGE>   18
 
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS
 
     The following analysis of the financial condition and results of operations
of the Company should be read in conjunction with the Consolidated Financial
Statements and Notes related thereto included elsewhere in this Prospectus.
 
OVERVIEW
 
     In recent years, the seismic equipment industry has undergone change as a
result of an increasing reliance by seismic contractors on 3-D data acquisition
systems with greater channel capacity. Because each channel of data requires at
least one geophone string to provide the input signal, the shift to larger
channel 3-D data acquisition systems has resulted in an increase in demand for
geophones, hydrophones, leader wire, geophone string connectors and telemetric
cable. The trend toward the use of seismic data acquisition systems with greater
channel capacity, coupled with higher seismic acquisition activity levels, has
also stimulated demand for the Company's other seismic related products.
 
     The Company has recently developed and introduced new products for both the
seismic industry and for other applications that have contributed to increased
revenues.
 
RESULTS OF OPERATIONS
 
     The following table sets forth for fiscal 1995, 1996 and 1997, the
percentage of certain income statement items to total sales:
 
<TABLE>
<CAPTION>
                                                           PERCENTAGE OF TOTAL SALES
                                                          ---------------------------
                                                           YEAR ENDED SEPTEMBER 30,
                                                          ---------------------------
                                                          1995       1996       1997
                                                          -----      -----      -----
<S>                                                       <C>        <C>        <C>
Sales...............................................      100.0%     100.0%     100.0%
Cost of sales.......................................       58.0       56.0       59.0
Gross profit........................................       42.0       44.0       41.0
Selling, general and administrative.................       17.9       21.8       19.7
Research and development............................        6.1        6.3        5.8
Bad debt expense (recovery).........................        3.1        9.3      (10.2)
Income from operations..............................       14.9        6.6       25.7
Other income (expense), net.........................       (2.9)      (1.5)       0.2
Income before income taxes..........................       12.0        5.1       25.9
Provision for income taxes..........................        4.8        1.8        9.8
Net income..........................................        7.2        3.3       16.1
</TABLE>
 
  Year Ended September 30, 1997 Compared to Year Ended September 30, 1996.
 
     Sales for fiscal 1997 were $41.0 million, an increase of $10.1 million, or
32.9%, from $30.9 million in fiscal 1996. The increase in sales was attributable
primarily to increased demand for the Company's products.
 
     Cost of sales for fiscal 1997 was $24.2 million, an increase of $6.9
million, or 40.3%, from $17.3 million in fiscal 1996. Cost of sales increased as
a percentage of total revenues to 59.0% in fiscal 1997 from 56.0% in fiscal
1996. Such percentage increase is the result of increased sales of products
containing higher manufacturing costs.
 
   
     Operating expenses for fiscal 1997 were $6.2 million, a decrease of $5.3
million, or 45.9%, from $11.5 million in fiscal 1996, primarily as a result of a
$4.4 million recovery on a note receivable previously written off. Operating
expenses decreased as a percentage of total revenues to 15.2% in fiscal 1997
from 37.4% in fiscal 1996. Selling, general and administrative expenses for
fiscal 1997 were $8.1 million, an increase of $1.4 million, or 20.1%, from $6.7
million in fiscal 1996. Selling, general and administrative expenses decreased
as a percentage of total revenue to 19.7% in fiscal 1997 from 21.8% in fiscal
1996, principally reflecting the impact of high sales volume and the leveraging
of certain fixed expenses. Research and development expenses for fiscal 1997
were $2.4 million, an increase of $0.4 million, or 22.1%, from $2.0 million in
fiscal 1996. Research and development expenses decreased as a percentage of
total sales to 5.8% in fiscal 1997 from 6.3% in fiscal 1996, principally
reflecting increased sales in the Company's geophone and thermal imaging product
lines.
    
 
                                       17
<PAGE>   19
 
   
     Bad debt expense for fiscal 1997 was a recovery of $4.2 million compared to
a charge of $2.9 million in fiscal 1996. The fiscal 1996 bad debt expense
relates principally to a single customer, Grant Geophysical, Inc. ("Grant"), who
sought protection under the United States bankruptcy laws in December 1996. As a
result, the Company recorded a bad debt charge of $2.8 million in fiscal 1996 in
addition to a bad debt charge of $1.5 million relating to Grant recorded in
fiscal 1992. The Company's claim against Grant was purchased (without recourse
to the Company) from the Company by a third party for $6.2 million in cash on
September 26, 1997. In connection with this transaction, the Company issued $1.0
million in purchase credit concessions to Grant, which is reflected on the
Company's consolidated balance sheet as a current liability at September 30,
1997. The remaining recovery, net of the $1.0 million purchase credit
concession, has been recorded as a bad debt recovery of $4.4 million, interest
income of $0.7 million and legal fee recovery of $0.1 million. The impact of
transactions with Grant on sales and net income for fiscal 1997 were $0.7
million and $3.2 million, respectively. The impact of transactions with Grant on
sales and net income (loss) for fiscal 1996 were $3.2 million and $(1.1)
million, respectively.
    
 
     The Company's effective tax rate for the year ended September 30, 1997 was
37.7% compared to 36.4% for fiscal 1996. Such increase represents higher state
income taxes in 1997.
 
  Year Ended September 30, 1996 Compared to Year Ended September 30, 1995.
 
     Sales for fiscal 1996 were $30.9 million, a decrease of $1.7 million, or
5.3% from $32.6 million in fiscal 1995. The decrease was attributable to reduced
demand for the Company's thermal imaging and geophone connector products.
 
     Cost of sales for fiscal 1996 were $17.3 million, a decrease of $1.6
million, or 8.6%, from $18.9 million in fiscal 1995. Cost of sales decreased as
a percentage of total revenues to 56.0% in 1996 from 58.0% in 1995, principally
attributable to increased prices on geophone and thermal imaging product lines.
 
   
     Operating expenses for fiscal 1996 were $11.5 million, an increase of $2.7
million, or 30.4%, from $8.9 million in fiscal 1995. Operating expenses
increased as a percentage of total revenues to 37.4% in 1996 from 27.1% in 1995.
Selling, general and administrative expenses for fiscal 1996 were $6.7 million,
an increase of $0.9 million, or 14.9%, from $5.9 million in fiscal 1995.
Selling, general and administrative expenses increased as a percentage of total
revenue to 21.8% in 1996 from 17.9% in 1995, principally reflecting lower sales
volume and higher incentive compensation expenses. Research and development
expenses for fiscal 1996 remained relatively constant at $2.0 million.
    
 
   
     Bad debt expense for fiscal 1996 was $2.9 million, an increase of $1.9
million, or 182.3% from $1.0 million in fiscal 1995. Such increase relates
principally to the $2.8 million Grant bad debt charge discussed above. The
impact of transactions with Grant on sales and net income (loss) for fiscal 1996
were $3.2 million and $(1.1) million, respectively. The impact of transactions
with Grant on sales and net income for fiscal 1995 were $1.4 million and $0.4
million, respectively. There were no Grant bad debt charges/recoveries in fiscal
1995.
    
 
     The Company's effective tax rate in fiscal 1996 was 36.4% compared to 40.3%
in fiscal 1995. The decrease in the effective tax rate principally relates to
adjustments to deferred tax assets relating to temporary differences in the
recognition of certain state income tax deductions.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     At September 30, 1997, the Company had $2.5 million in cash and cash
equivalents. For the year ended September 30, 1997, cash provided by operating
activities was $10.0 million principally consisting of net income of $6.6
million and the noncash impact of deferred income taxes and depreciation and
amortization totaling $3.0 million. The principal uses of cash in operations
during this period were to fund an approximate $3.2 million increase in accounts
and notes receivable and inventories, principally relating to seismic products.
These increases were due principally to higher sales levels during fiscal 1997
compared to fiscal 1996. While the Company typically does not maintain
substantial inventory and operates on an order-in-hand basis with respect to
most of its products, it does increase its inventory of components from time to
time, as it makes judgements as to demand, to assure continuous and ready
supplies. Specifically, at September 30, 1997, the Company maintained higher
than normal inventory levels relating to thermal plotters and related
components. Additionally, the Company experienced higher accounts receivable
because of longer payment terms with certain commercial graphics customers and a
greater volume of sales with such extended payment terms. This
 
                                       18
<PAGE>   20
 
use of cash to fund the increases in receivables and inventories was offset by
$3.3 million of increases in accrued expenses and income tax payable.
 
     For the year ended September 30, 1997, the Company used approximately $5.6
million in investing activities, comprising capital expenditures of
approximately $6.4 million less approximately $0.8 million in proceeds from the
sale of rental equipment and other property, plant and equipment. Included in
capital expenditures is the purchase of $2.5 million of land, buildings and
equipment from affiliates. The Company expects that its capital expenditures in
fiscal 1998 to support currently existing product lines and develop new product
lines will be $6.0 million, including $3.0 million for the construction of an
additional manufacturing facility.
 
     Financing activities for the year ended September 30, 1997 used $2.7
million of cash, principally consisting of the repayment of notes payable to
related parties of $9.7 million partially offset by $5.6 million of cash
received from OYO U.S.A. for outstanding receivables and additional capital
contributions. In addition, the Company borrowed $1.5 million from banks.
 
     At September 30, 1996, the Company had $0.8 million in cash and cash
equivalents. For the year ended September 30, 1996, cash provided by operating
activities was $0.5 million, principally consisting of net income of $1.0
million, adjusted for the noncash items (principally depreciation and
amortization and bad debt expense) totaling $3.1 million, offset by $3.6 million
of net increases in working capital, principally receivables and inventories.
 
     For the year ended September 30, 1996, the Company used approximately $1.9
million in investing activities primarily consisting of capital expenditures of
$2.1 million, the purchase of an affiliated entity for $1.0 million less $1.1
million in proceeds from the sale of rental equipment and property, plant and
equipment.
 
     Financing activities provided $1.2 million for the year ended September 30,
1996 principally due to payments received from OYO U.S.A.
 
     At September 30, 1995, the Company had $1.0 million in cash and cash
equivalents. For the year ended September 30, 1995, cash provided by operating
activities was $0.8 million, principally consisting of $2.3 million of net
income, the noncash impact of depreciation and amortization and bad debt expense
totaling $1.9 million, offset by $3.4 million of net increases in working
capital, principally composed of increases in receivables, inventories and
accounts payable.
 
     For the year ended September 30, 1995, the Company used $1.1 million in
investing activities primarily consisting of capital expenditures of $1.4
million less approximately $0.3 million in proceeds from the sale of rental
equipment and other property, plant and equipment.
 
     The Company intends to use approximately $3.0 million of the net proceeds
of the Offering to fund a planned expansion of its primary manufacturing
facility, approximately $1.0 million to construct, lease or purchase additional
facilities and equipment to diversify its manufacturing capability to include
five-strand leader wire and telemetric cable and $1.5 million to repay
short-term debt. The Company intends to use the remainder of the net proceeds to
meet higher working capital requirements associated with expanded capacity and
new product lines, and for other general corporate purposes, including potential
acquisitions. As the Company has not yet started an acquisition program, it is
not able to estimate the elements of an acquisition program, or the costs
thereof. Moreover, the Company may use its equity securities in connection with
any potential acquisition.
 
     Although the Company strives to fill orders for its products within 60 days
of the date they are received, in recent months the Company has taken 90 days or
longer to deliver on certain orders due to its limited capacity to meet an
increased number and size of orders. While the increase in order fill time has
not adversely affected the Company's results of operations or liquidity in any
period covered by the Consolidated Financial Statements included elsewhere in
this Prospectus, it has limited the Company's growth in sales, thereby limiting
growth in cash provided by operations. The Company expects that its planned
expansion will increase its capacity and partially alleviate the increased order
fill time. The Company also expects this planned expansion and increased
production to result in higher working capital requirements.
 
     At September 30, 1997, the Company had $1.5 million of outstanding bank
indebtedness, all of which is expected to be repaid from the net proceeds of the
Offering. See "Use of Proceeds". Historically, the
 
                                       19
<PAGE>   21
 
   
Company has relied on various intercompany arrangements with OYO U.S.A. for its
financing requirements pursuant to which no interest was paid to or from OYO
U.S.A. After the Offering, the Company expects that OYO Japan will no longer
guarantee any indebtedness for the Company's benefit. However, the Company
expects to be able to obtain new working capital lines of credit with one or
more banks (which, if secured, would be secured solely by the Company's assets),
given the Company's favorable balance sheet after the application of the
proceeds of the Offering. Additionally, the Company may seek to arrange
additional financing in conjunction with acquisitions or material internal
expansion. While no committed lines of credit are currently in place, the
Company believes that its favorable balance sheet after the Offering will be
sufficient to support such lines of credit. However, there can be no assurance
that such facilities will be available to the Company on terms the Company
considers reasonable or that such facilities will not increase the Company's
cost of capital over historical periods.
    
 
     On September 26, 1997, the Company received $6.2 million on certain notes
receivable that had been fully charged to bad debt expense in 1992 and 1996.
These notes receivable had been from a single customer, Grant Geophysical, Inc.
("Grant"), who sought protection under the United States bankruptcy laws in
1996. The Company's claim against Grant was purchased by a third party for cash.
In connection with this transaction, the Company issued $1.0 million in purchase
credit concessions to Grant, which is reflected on its balance sheet as a
current liability at September 30, 1997. See Note 4 to the Notes to the
Consolidated Financial Statements, contained elsewhere in this Prospectus.
 
   
     The Company is investigating the purchase of a facility for new office
space and for certain research and development activities. The Company estimates
that the cost of this facility, if it is purchased, will be approximately $1.3
million. The Company expects to finance this purchase through a loan from a
commercial bank to be secured by the facility.
    
 
     The Company believes that the combination of cash flow from operations,
credit facilities it expects to enter into and the net proceeds of the Offering
should provide the Company with sufficient capital resources and liquidity to
fund its operations for fiscal 1998 and support an acquisition and expansion
program as described elsewhere in this Prospectus. However, there can be no
assurance that such sources of capital will be sufficient to support an
acquisition and expansion program in fiscal 1998 or in the long-term or
otherwise support the Company's capital requirements, and the Company may be
required to issue additional debt or equity securities in the future to meet its
capital requirements.
 
     Inflation has not had a significant impact on the Company's operations to
date.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
     In February 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 128, Earnings Per Share ("SFAS
128"). SFAS 128 changes the computation of earnings per share and requires dual
presentation of basic and diluted earnings per share. SFAS 128 is effective for
financial statements issued for periods ending after December 15, 1997,
including interim periods. SFAS 128 is not expected to have a material impact on
the Company's earnings per share.
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, "Reporting Comprehensive Income" ("SFAS 130"). SFAS 130 establishes
standards for reporting and display of comprehensive income and its components
(revenues, expenses, gains and losses) in a full set of general-purpose
financial statements. It requires (a) classification of the components of other
comprehensive income by their nature in a financial statement and (b) the
display of the accumulated balance of the other comprehensive income separate
from retained earnings and additional paid-in capital in the equity section of a
statement of financial position. SFAS 130 is effective for years beginning after
December 15, 1997 and is not expected to have a material impact on the Company's
financial statements.
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, "Disclosure about Segments of an Enterprise and Related Information"
("SFAS 131"). SFAS 131 establishes standards for reporting information about
operating segments in annual financial statements and requires selected
information about operating segments in interim financial reports issued to
shareholders. It also establishes standards for related disclosures about
products and services, geographic areas and major customers. The Company has not
determined the impact of SFAS 131 on its financial reporting practices.
 
                                       20
<PAGE>   22
 
                                    BUSINESS
 
GENERAL
 
     OYO Geospace Corporation designs and manufactures instruments and equipment
used in the acquisition and processing of seismic data. The Company has been in
the seismic instrument and equipment business since 1980, and markets its
products primarily to the oil and gas industry worldwide. The Company's product
lines currently include geophones and hydrophones, seismic leader wire, geophone
string connectors, thermal imaging products and small data acquisition systems
targeted at niche markets. The Company's products are compatible with most major
seismic data acquisition systems currently in use, and sales result primarily
from seismic contractors purchasing the Company's products as peripheral
components of new data acquisition systems or to replace or upgrade peripheral
components of data acquisition systems already in use. The Company believes that
its products are among the most technologically advanced instruments and
equipment available for seismic data acquisition.
 
     The Company has recently introduced a line of high resolution, wide format
thermal plotters for use in the commercial graphics industry. This product line
is an outgrowth of its seismic thermal imaging product line. In addition, OYO
Geospace plans to expand its product lines with the commencement of seismic
telemetric cable manufacturing in fiscal 1998. The Company has begun producing
and testing seismic telemetric cable, and such products are in the final stages
of development. The Company also plans to expand its product lines further
through research and development and through selective acquisitions, focusing in
the areas of (i) seismic instruments and equipment used in time lapse 3-D
seismic data acquisition (the acquisition of 3-D seismic data repeated in the
same area over time in order to track fluid movement in a reservoir), (ii)
three-axis seismic data acquisition (the acquisition of seismic data on three
axes to determine rock properties and fluid types) and (iii) borehole seismology
(the process of generating and/or recording seismic waves in existing well
bores). The Company estimates that it will incur approximately $1.0 million in
capital expenditures to acquire sufficient equipment to allow it to produce and
market seismic telemetric cable in commercial quantities. The other targeted
expansions of the Company's product lines are in the planning and development
stage, and the Company is unable to estimate its capital investment requirements
in those regards or whether such expansions will be undertaken through strategic
acquisitions.
 
     To position OYO Geospace for increased growth, the Company recently hired a
new senior management team headed by Gary D. Owens, Chairman of the Board,
President and Chief Executive Officer. Prior to joining OYO Geospace in August
1997, Mr. Owens served in various positions with Input/Output, Inc.
("Input/Output"), a leading manufacturer of seismic data acquisition systems and
related equipment, from 1977 to May 1997, most recently as President and Chief
Executive Officer. Other recent additions to the Company's senior management
include Michael J. Sheen, Vice President and Chief Technical Officer, and Thomas
T. McEntire, Chief Financial Officer. Mr. Sheen served in various positions at
Input/Output from 1977 to June 1997, most recently as Senior Vice President and
Chief Technical Officer. Mr. McEntire served in senior financial positions for
APS Holding Corporation, a nationwide distributor of automotive parts and
accessories, from 1990 to September 1997, most recently as Financial Controller.
 
                                       21
<PAGE>   23
 
BUSINESS STRATEGY
 
     The Company's new senior management team has developed a business strategy
designed to accelerate the Company's rate of growth. Pursuant to this strategy,
the Company will seek to:
 
     - Significantly Expand Manufacturing Capacity of Existing Products -- The
       Company plans to commence a 45,000 square foot expansion of one of the
       Company's Houston-based manufacturing facilities in the first quarter of
       fiscal 1998. Planned for completion in the third quarter of fiscal 1998,
       the expansion will significantly increase the Company's geophone,
       hydrophone and multi-strand leader wire manufacturing capacity.
 
     - Expand Product Lines -- In fiscal 1998, the Company intends to construct
       or lease additional facilities to diversify its manufacturing capability
       to include five-strand leader wire and telemetric cable used in the land
       and marine seismic data acquisition markets.
 
     - Increase Research and Development Investment -- During fiscal years 1995
       through 1997, the Company's research and development investment averaged
       $2.1 million per annum or 6.1% of revenues. Management intends to
       increase such expenditures gradually in future periods, with an emphasis
       on the development of new technologies to serve the rapidly emerging
       markets for time lapse 3-D seismic data acquisition, three-axis seismic
       data acquisition and borehole seismology surveys.
 
     - Continue to Develop Non-Seismic Markets for the Company's
       Technologies -- OYO Geospace has committed significant resources to adapt
       the Company's thermal imaging products for use in commercial graphics
       applications. Management believes that the development of additional non-
       seismic applications for its technologies will diversify the Company's
       revenue base and expose the Company to larger markets.
 
     - Selectively Pursue Niche Acquisitions -- Management intends to supplement
       the Company's internal growth through the acquisition of manufacturers of
       seismic-related products. While the seismic equipment industry has
       undergone consolidation in recent years, the industry continues to be
       populated by numerous niche manufacturers, certain of which may become
       available for acquisition by the Company. However, OYO Geospace is not
       presently in discussions with any potential acquisition candidates, and
       no assurances can be made that any acquisitions will be available to the
       Company on attractive terms.
 
SEISMIC INDUSTRY OVERVIEW
 
     Seismic data is the principal source of information used by geoscientists
to map potential or existing oil and gas bearing formations and the geologic
structures that surround them. Seismic data is used primarily in connection with
the exploration, development and production of oil and gas. The process of
seismic data acquisition is conducted in several stages. First, an energy source
imparts seismic waves into the earth, reflections of which are received and
measured by geophones and hydrophones. Electrical signals generated by the
geophones and hydrophones are then transmitted through leader wire, geophone and
hydrophone string connectors and telemetric cable to data collection units,
which store information for processing and analysis.
 
     The Company believes that several important trends have impacted the
seismic industry in recent years and will have positive effects on the Company's
business. First, the outsourcing of seismic instrument and equipment
manufacturing operations by large geophysical contractors has substantially
increased the Company's universe of potential customers. Second, one of the
primary advancements in the 3-D seismic data acquisition process has been the
trend toward larger and higher resolution surveys, requiring higher channel
counts and resulting in the use of more geophones, hydrophones, leader wire,
connectors and telemetric cable. Third, the increased size and expense of
seismic surveys has caused a continuing consolidation of geophysical contractors
resulting in a number of larger, better capitalized contractors that utilize
greater quantities of sophisticated seismic instruments and equipment. Finally,
declining computing equipment costs are making 3-D seismic technology available
to a larger number of independent oil and gas companies, improving demand for
3-D seismic surveys and seismic instruments and equipment.
 
                                       22
<PAGE>   24
 
THE SEISMIC DATA ACQUISITION PROCESS
 
     The diagram set forth below depicts the "data chain" pertaining to seismic
data acquisition and processing. Following the diagram from left to right, an
energy source imparts seismic energy into the earth and sensors receive
reflections of such energy from subsurface formations and transmit energy
through leader wires, connectors and telemetric cables to a sequential chain of
data handling devices, which ultimately produce information for analysis.
 
                               SEISMIC DATA CHAIN
 
                            SEISMIC DATA CHAIN CHART
 
  Current Methods
 
     The oil and gas exploration and development process typically begins with
the selection of a defined geographical area and the collection and analysis of
various types of data, including seismic and well log data, that may provide
information as to the existence and location of potential oil and gas reservoirs
within the target area. Seismic data is the principal source of information used
by geoscientists to map potential oil and gas bearing formations and the
geologic structures that surround them. Seismic data is acquired over a wide
area by directing seismic waves into the earth and measuring the response as
these seismic waves reflect from subsurface geologic features. Because seismic
waves reflect differently from different types of subsurface formations,
measurements of these reflections can be used to construct a model of the
subsurface structure.
 
     In seismic data acquisition, an energy source is used to impart seismic
waves into the earth. For land systems, this energy source is either vibroseis
or an explosive charge. In marine environments, a device called an air gun is
used to generate the seismic waves. The reflections of these seismic waves are
received and measured by seismic sensors, either geophones (typically on land)
or hydrophones (in water), which convert the reflected seismic waves into an
electrical signal. Geophones are typically enclosed in a plastic or polyurethane
case. A land geophone case may include a metal spike for positioning and
coupling to the ground. Hydrophones are typically attached inside a streamer
cable or attached to a bottom cable by a marine connector. For land systems, a
string of geophones is generally used as the seismic sensor. The electrical
output of each geophone string becomes the electrical input for one recording
channel, or "trace," of seismic data. A geophone string typically consists of
six to twelve geophones connected by electrically conductive cable, called
"leader wire," and is terminated into a geophone string connector. Geophones
measure the ground motion caused by the seismic wave reflection and convert this
movement of the earth into an analog electrical signal, which is passed along
the leader wire to the geophone string connector. The leader wire is then
connected by multi-stand telemetric cable to a remote data collection unit. This
multi-strand telemetric cable is typically 50 to 300 meters in length and is
connected by cable connectors. Typically, six channels of analog seismic data
will feed into a remote data collection unit, which then digitizes the analog
signal and transmits it via telemetric cable and cable connectors to a central
electronics unit, where all of the data from the seismic survey is stored in
digital form, generally on magnetic tape. In marine environments, cable and
cable connectors are also utilized to transmit the data. In transition zone and
shallow depths, bottom cables are laid on the subsea floor. In deeper waters,
cables called "streamers" are towed behind vessels equipped with an on-board
data recording system. Both land and marine data recording systems will
typically utilize a field data monitor to enable the seismic contractor to
evaluate the quality of the data received before the crew moves to the next
recording location.
 
     After the seismic data is collected, it is processed and analyzed with
sophisticated computer imaging software to generate images of the subsurface
lithology and structure being investigated. These images are
 
                                       23
<PAGE>   25
 
then displayed using field cameras and plotters. Monochrome plotters are
generally used to display preliminary evaluations. Color plotters are generally
used to display final interpretations of the data.
 
  Developing Methods
 
     Time Lapse 3-D Seismic Data Acquisition. The 3-D seismic data acquisition
process is being developed for use in characterizing producing reservoirs by
repeating the process over the same area during the life of the reservoir and
comparing the results to earlier surveys. Differences in the surveys are used to
identify changes in the reservoir caused by production and the effects of
enhanced recovery techniques and allow reservoir engineers to more efficiently
drain the reservoir.
 
     Three-Axis Seismic Data Acquisition. The 3-D seismic data acquisition
process is being further developed to expand seismic data acquisition from a
single axis direction to 3-axis direction by positioning three geophones on the
"x", "y" and "z" axes. The additional information provided by this process
allows for the possible interpretation of rock properties (permeability and
porosity) and fluid types (oil, gas and water).
 
     Borehole Seismology. An alternative method of seismic data acquisition,
borehole seismology, employs techniques that place either the energy source, the
seismic sensors or both into an existing borehole. The sensors are placed near
or within the rock formation being surveyed to achieve better seismic imaging of
rock properties and geologic structures. Seismic detector systems used in
reservoir characterization include high quality multi-level borehole systems
capable of near real-time data telemetry to advanced seismic recorders at the
surface. Techniques employed in reservoir monitoring include monitoring natural
or induced microseismic activity, vertical seismic profile (energy source at the
surface, sensor in the wellbore), reverse vertical seismic profile (energy
source in the wellbore, sensors on the surface), crosswell seismic imaging
(energy source in one well, sensor in another well), single well seismic imaging
(energy source and sensor in the same wellbore) and various combinations of
these methods.
 
PRODUCTS AND COMPETITION
 
     OYO Geospace's core products are instruments and equipment that either
measure some aspect of the physical environment or display such a measurement in
a usable manner. The principal focus of the Company is seismic measurement;
however, the Company has also applied its technology in certain other
industries.
 
  Instruments and Equipment
 
     The Company is one of the world's leading manufacturers and distributors of
geophones and hydrophones (sometimes collectively referred to as seismic
"sensors"), along with ancillary equipment such as geophone cases and
connectors. Sensors accounted for approximately 54% of the Company's sales in
each of fiscal 1995, 1996 and 1997.
 
     Geophones. Geophones are electromagnetic sensor devices that detect energy
from the earth's subsurface. A magnet is attached to the inside frame of the
geophone, which is fixed as securely as possible to the earth's surface so that
it will move in unison with the earth in response to seismic reflections. A coil
of wire is suspended within the magnetic field by springs from the inside frame
of the geophone and is the inertial element. The relative motion between the
magnetic field produced by the permanent magnet and the coil produces a voltage,
with the voltage being proportional to the velocity of the motion.
 
     The Company's GS-20DX geophone, which the Company still manufactures and
sells, historically was the Company's standard geophone. However, because new
data acquisition systems, such as the 24-bit 3-D systems, are capable of
acquiring much more data with greater accuracy than conventional 2-D systems,
the Company determined that a more uniform and precise geophone would result in
better signal quality and, hence, better subsurface imaging. Since 1992, the
Company has introduced its GS-30CT and GS-32CT geophones, which provide greater
geophone-to-geophone uniformity, lower signal distortion and substantially
tighter tolerances on key geophone parameters. This improved signal quality
allows customers to take full advantage of the capabilities of 24-bit 3-D
acquisition systems. The use of 24-bit recording techniques makes possible the
recording of higher fidelity seismic signals by means of increasing the number
of bits (each "bit" is a binary digit or unit of information, e.g., a "zero" or
"one") in the digital data stream.
 
                                       24
<PAGE>   26
 
     The Company's geophones are also used in certain industrial and
geo-engineering applications such as intrusion detection, structural evaluation
and vibration monitoring. In fiscal 1997, the Company derived approximately $1.1
million in revenue from sales of geophones outside the seismic markets.
 
     The Company offers a warranty on its geophones against defects in materials
and workmanship for a period of three years. The Company believes that this is
the longest manufacturer's warranty available for such products in the seismic
industry.
 
     Hydrophones. Hydrophones use piezoelectric materials (which are materials
that can create an electrical charge as a result of subjecting them to
mechanical stress) which respond to changes in pressure associated with a
seismic signal. The Company manufactures a line of hydrophones for use primarily
in swamps, rivers, bays and transition zones.
 
     Geophone and Hydrophone String Connectors. Geophone and hydrophone string
connectors are used to electrically connect a group of geophones or hydrophones
to a seismic data recording system. These connectors are either input
connectors, which are attached to a data recording instrument directly or
through telemetric cable, or output connectors installed on geophones or
hydrophones. Approximately 80% of the Company's connector revenues are from the
sale of output connectors. Typically, a string of twelve geophones will have one
output connector attached to the end of the string.
 
     Geophone and hydrophone string connectors must be rugged and highly
resistant to both water entry and electrical leakage. The Company was the first
to develop, successfully patent and sell a single-unit paralleling connector,
the KC2 line of connectors, which allows users to electrically connect more than
one geophone string into a single recording channel. In certain environments,
optimal signal quality requires up to six geophone strings per channel. The
Company's extensive line of single-unit paralleling connectors greatly
simplifies the linking of multiple geophone strings per channel. Geophone and
hydrophone string connectors accounted for approximately 11%, 10% and 12% of the
Company's sales in fiscal 1995, 1996 and 1997, respectively.
 
  Competition for Seismic Instruments and Equipment
 
     The Company's principal competitors for geophones, hydrophones and geophone
string connectors are Input/Output, Inc. and Mark Products. The Company believes
that it is one of the largest manufacturers and distributors of geophones,
hydrophones and geophone string connectors in the world. In addition to the
competitors named above, certain manufacturers of marine streamers also
manufacture hydrophones for their own use.
 
     The Company believes that the principal competitive factors in the seismic
instruments and equipment market are technological superiority, product
durability and reliability and customer service and support. Price and product
delivery are also important considerations for customers. These factors can be
offset by a customer's standardization preferences. In general, particular
customers prefer to standardize geophones and hydrophones, particularly if they
are used by a single seismic crew or multiple crews that can support each other.
This is a factor in the ability of a geophone or hydrophone manufacturer to gain
market share from other such manufacturers.
 
     A key competitive factor for land field instruments and equipment, and to a
lesser degree for marine instruments and equipment, is durability under harsh
field conditions. Especially for land data acquisition systems, the field
instruments and equipment must not only meet rigorous technical specifications
regarding signal integrity and sensitivity, but must also be extremely rugged
and durable to withstand the rigors of field use, often in harsh environments.
 
     With respect to competition concerning geophones, the Company and an agency
of the government of the People's Republic of China agreed in 1995 to terminate
a joint venture for the manufacturer of geophones in China based on the design
for the Company's GS-20DX geophone. Whereas previously the joint venture company
was restricted to marketing such geophones in China, the former joint venture
partner currently has the capability and legal right to manufacture and market
them without restriction. Although the GS-20DX geophone has been superseded by
the more technologically advanced GS-30CT and GS-32CT
 
                                       25
<PAGE>   27
 
geophones, which the former joint venture partner has no capabilities or rights
to produce, the Company continues to manufacture and sell limited quantities of
the GS-20DX geophone and, therefore, may experience some competition with
respect to this older model geophone. The Company is unable to predict the
extent or effect of any such competition.
 
  Data Handling Devices
 
     The Company is a leading manufacturer and distributor of three lines of
seismic instruments that handle or manipulate seismic data, two of which involve
thermal imaging.
 
     Thermal Imaging Products. The Company designs, manufacturers and sells two
lines of products based on thermal imaging technology: (i) a line of digital
field monitors, sometimes referred to in the seismic industry as "field cameras"
and (ii) a line of office plotters. Thermal imaging is based on a computer-
controlled process called "rasterization," whereby an image to be portrayed is
divided into a number of dots per inch. Each dot is defined to be either light
or dark. This "rasterized" data is then transmitted to the printhead, which
consists of small resistors, called "nibs," whose density corresponds to the dpi
rasterization density. A chemically treated heat-sensitive medium, usually
either paper or film, is advanced on a roller under the printhead. The
rasterized data generates instructions which turn each nib either on or off as
the medium is advanced. If the nib is on, it generates heat resulting in a black
dot on the paper or film. A nib which is off does not produce a mark. The
greater the number of dots per inch, the clearer and more precise the image
produced. Most of the Company's products are capable of either 400 or 600 dpi
image clarity.
 
     The Company manufactures a line of digital field monitors. Digital field
monitors are PC-based units capable of rapid data rasterization and display of
seismic data using thermal plotting technology. The Company's DFM-480-P uses a
Pentium microprocessor. These compact units are generally used by seismic and
other geophysical contractors and their customers for quality assurance during
the acquisition of seismic data. Because of the cost of moving a seismic crew
from one location to another, it is critical that seismic data be reviewed in
the field to measure the data quality and determine if a re-shoot is necessary
before moving to the next location. The Company's digital field monitors are
compatible with most seismic data acquisition systems. Product durability and
performance, low maintenance requirements and environmental safety are the
principal competitive factors regarding digital field monitors.
 
     The Company also manufactures and sells a complete range of direct thermal
raster plotters for office or field use with printhead widths ranging from 8
inches to 54 inches. These monochrome plotters are used primarily by seismic and
other geophysical contractors and users of seismic data to inspect and evaluate
seismic data, often during processing and before final presentation of the
seismic images. Although color plotters are often used to portray seismic data
in its final presentation form, monochrome thermal plotters are preferable for
use during seismic data processing and in other applications because of their
substantially lower price and operating cost, their low maintenance requirements
and environmental safety. Additionally, the Company's thermal plotters are
designed to be rugged and highly durable. The principal competitive factors
affecting a customer's choice of thermal plotters are product performance and
technological superiority, while price has historically been a less important
competitive factor.
 
     The Company believes that it is one of the largest providers of thermal
imaging products to the seismic industry. Principal competitors include
Atlantek, Calcomp and Veritas for office plotters, and Veritas, Ref Tek and
Seistronix for field monitors.
 
     The Company also has successfully adapted its thermal plotting technology
originally developed for the seismic industry for applications in the newsprint,
silkscreen and corrugated printing industries. Using new dry film technology
developed in conjunction with a film manufacturer, the Company believes that its
wide format thermal printers are a cost-effective alternative to conventional
equipment. The Company expects to continue its research and development
activities directed toward expanding the markets for its thermal imaging
products, including increasing the dpi image clarity of its products. Thermal
plotters accounted for approximately 26%, 31% and 30% of the Company's sales in
fiscal 1995, 1996 and 1997, respectively.
 
                                       26
<PAGE>   28
 
     Data Acquisition Systems. The Company manufactures and sells a seismic data
acquisition system identified as the model DAS-1, which is capable of recording
and processing up to 144 channels of data. The DAS-1 was originally designed to
satisfy the needs of the geo-engineering market, which generally focuses on
relatively shallow subsurface structures. However, the DAS-1 has also been used
by oil and gas seismic contractors as a cost-effective way to collect and
process data using state-of-the-art 24-bit technology for 2-D seismic
applications. Because of their high cost, larger channel systems such as the
Input/Output System Two, which are capable of collecting and processing over
2,000 channels of data, are not always efficient for use in seismic data surveys
requiring fewer channels. The Company believes that the relative cost of the
DAS-1 is a principal competitive advantage over larger channel capacity data
acquisition systems. Technological superiority and product performance are
principal competitive factors.
 
MANUFACTURING OPERATIONS AND FACILITIES
 
     The Company manufactures or assembles its products and spare parts and
renovates and repairs instruments at its various facilities in the United States
and Canada. The Company's manufacturing and products assembly operations consist
of machining or molding the necessary component parts, configuring these parts
along with components received from various vendors and assembling a final
product. Upon completion, the final products undergo functional and
environmental testing to the extremes of product specifications and final
quality assurance inspection. Because the Company normally manufactures and
ships based on customer orders, the Company maintains no significant inventory
of finished goods.
 
     The principal design, manufacturing and assembly operations of the Company
are conducted at the following locations.
 
<TABLE>
<CAPTION>
                                        APPROXIMATE
                             OWNED/     FLOOR SPACE
         LOCATION            LEASED    (SQUARE FEET)                  PRINCIPAL USE
         --------            ------    -------------                  -------------
<S>                          <C>       <C>              <C>
Houston, Texas.............  Owned        32,800        Corporate headquarters, manufacturing and
                                                          sales
Houston, Texas.............  Leased       34,000        Manufacturing and sales
Houston, Texas.............  Owned        11,000        Manufacturing and sales
Calgary, Alberta, Canada...  Owned        21,000        Rentals and warehouse
</TABLE>
 
   
     The corporate headquarters and sensor manufacturing space in Houston,
Texas, and the geophone string rental and warehouse space in Calgary, Alberta,
Canada were recently purchased from affiliates of OYO Japan for an aggregate
purchase price of $2.4 million. See "Relationship With OYO Japan and Related
Transactions." The Company plans to commence a 45,000 square foot expansion of
its primary facility in Houston, Texas in the first quarter of fiscal 1998 for
an estimated cost of $3.0 million. The expansion is expected to be completed in
the third quarter of fiscal 1998. The Company is also contemplating the purchase
of a facility for new office space and for certain research and development
activities. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources." Following such
additions, the Company believes that its owned and leased facilities will be
adequate for its current and immediately projected needs.
    
 
SUPPLIERS
 
     Although the Company is not presently experiencing any supply or quality
control problems with its suppliers, such problems could have a significant
effect on its ability to meet production and sales commitments. Certain items
are currently provided by only one vendor. Although the Company believes it
maintains an adequate inventory of these single source items, the loss of ready
access to any of these items could temporarily disrupt the Company's ability to
manufacture and sell certain products. In particular a Japanese manufacturer
unaffiliated with the Company is the only current supplier of wide format
printheads for the Company's wide format thermal plotters. If this supplier were
no longer to supply these printheads or was unable or unwilling to supply such
items in sufficient quantity to meet the Company's requirements, the Company's
ability to compete in the wide format thermal plotting market could be severely
impeded. See "Risk Factors -- Reliance on Single Supplier as to One Product and
on Other Vendors."
 
                                       27
<PAGE>   29
 
MARKETS AND CUSTOMERS
 
     The Company's principal customers are seismic contractors or major,
independent and government owned oil and gas companies that either operate their
own seismic crews or specify specific seismic instrument and equipment
preferences to contractors. In addition to the seismic industry, the Company
sells its wide format thermal plotters for use in the newsprint, silkscreen and
corrugated printing industries. To date, the Company has sold these products
primarily to equipment distributors that focus on these industries.
 
     The Company sells its products through a direct sales force consisting of
Company employees and through several international third-party sales
representatives responsible for key geographic areas. Sales personnel generally
have industry experience or expertise. In addition, the Company sells certain
seismic instruments on a nonexclusive basis through OYO Japan and its
affiliates.
 
     In general, products are sold on standard 30-day credit terms. However, in
order to meet competitive pressures, sales are also made on extended term credit
arrangements. Under certain circumstances, certain of the Company's customers
have been unable to pay the Company under agreed terms, causing the Company to
agree to arrangements for extended payment terms. In the past, the doubtful
collectibility of certain accounts relating to sales or leases of seismic
instruments and equipment have resulted in material financial losses reflected
in the Company's financial statements. Additionally, the Company rents geophone
strings in Canada to seismic contractors operating there. The Company's rental
terms are generally based on days usage of the equipment by the customer, with
rental payments being due on standard 30-day credit terms.
 
     Although the Company strives to fill orders for its products within 60 days
of the date they are received, in recent months the Company has taken 90 days or
longer to deliver on certain orders due to its limited capacity to meet an
increased number and size of orders. The Company expects to increase its
capacity in fiscal 1998 through the expansion of existing facilities and
possibly through the construction or lease of additional facilities. See "Risk
Factors -- Limitations on Production Capacity; Increased Delivery Times" and
"Use of Proceeds."
 
     Grant accounted for 10.4% of the Company's sales in fiscal 1996. No other
single customer has accounted for 10% or more of the Company's sales in any of
the past three fiscal years.
 
     For information on the Company's foreign operations, see note 14 to the
Notes to the Company's Consolidated Financial Statements included elsewhere in
this Prospectus.
 
REGULATION
 
     The Company's operations are subject to numerous local, state and federal
laws and regulations concerning the containment and disposal of hazardous
materials. The Company does not foresee the need for significant expenditures to
ensure continued compliance with current environmental protection laws.
Regulations in this area are subject to change, and there can be no assurance
that future laws or regulations will not have a material adverse effect on the
Company.
 
INTELLECTUAL PROPERTY
 
     The Company seeks to protect its intellectual property by means of patents,
trademarks, trade secrets and other measures. It is generally the Company's
policy to file patent applications for all product designs and product
enhancements where such patent protection may have commercial value. Currently,
the Company is the assignee for several outstanding patents related to its
seismic instrument and equipment business, and has additional patent
applications pending. Some of the Company's products utilize and offer features
covered by the Company's patents, and such features are considered to be
important. However, no single patent nor the patents as a group are considered
essential to the success of the Company.
 
     It is the Company's policy to aggressively defend and protect its interests
in its intellectual property, including, when necessary, resorting to legal
proceedings to halt infringement, bar improper use and recover damages. No such
proceedings are currently pending.
 
                                       28
<PAGE>   30
 
EMPLOYEES
 
     As of September 30, 1997, the Company employed approximately 280 people on
a full-time basis, of whom 249 were employed in the United States. The Company
has never experienced a work stoppage and considers its relationship with its
employees to be satisfactory. None of the Company's employees are unionized.
 
LEGAL PROCEEDINGS
 
     From time to time the Company is a party to what it believes is routine
litigation and proceedings that may be considered as part of the ordinary course
of its business.
 
     The Company has received a copy of a letter from a law firm representing
Input/Output, Inc. which was sent to certain employees of the Company, including
Messrs. Owens and Sheen, who formerly were employees of Input/Output, making
certain accusations and threats on account of their employment by the Company.
It appears to be the allegation that such employees, by accepting employment
with the Company, have breached obligations as to confidential information,
trade secrets and (with respect to certain of such employees excluding Messrs.
Owens and Sheen) non-competition with Input/Output and that the Company had some
role in such activities. While it is unable to predict whether any action will
be taken against it or against any such employees, the Company does not believe
that it has done anything improper in hiring certain former employees of
Input/Output and will vigorously defend against any claim made against it in
such regards. The Company further understands that such employees, and in
particular Messrs. Owens and Sheen, will likewise vigorously defend against any
such claim. Nonetheless, should Input/Output pursue legal action against the
Company with respect to these matters and prevail, such proceeding could have an
adverse effect on the Company's business, results of operations, cash flows or
financial condition.
 
     The Company is not aware of any other current or pending litigation or
proceedings that could have a material adverse effect on the Company's results
of operations, cash flows or financial condition.
 
                                       29
<PAGE>   31
 
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
     In connection with the Offering, the Board of Directors of the Company will
be expanded to seven positions. The Company's Restated Certificate of
Incorporation provides for the classification of the Board of Directors into
three classes of directors (Class I, Class II and Class III), with the term of
each class expiring at successive annual stockholders' meetings. At and after
the 1998 annual meeting of stockholders, all nominees of the class standing for
election will be elected for three-year terms. It is intended that the directors
named below will constitute the Board of Directors of the Company immediately
after the closing of the Offering.
 
     The following table sets forth the names, ages and titles of the Company's
directors and executive officers and significant employees of the Company's
subsidiaries as they will exist immediately after the closing of the Offering
and, with respect to directors, the year of expiration of their initial term of
office.
 
<TABLE>
<CAPTION>
                                                                                             YEAR TERM
                                                                                            AS DIRECTOR
                   NAME                     AGE                  POSITION                   WILL EXPIRE
                   ----                     ---                  --------                   -----------
<S>                                         <C>   <C>                                       <C>
Gary D. Owens.............................  50    Chairman of the Board, President and         2000
                                                    Chief Executive Officer
Michael J. Sheen(1).......................  49    Vice President and Chief Technical           1999
                                                    Officer and Director
Thomas T. McEntire........................  37    Chief Financial Officer
Arnold Pater..............................  57    President, OYO Instruments
Thomas L. Davis, Ph.D.(1)(2)(3)...........  50    Director                                     1998
Ernest M. Hall, Jr........................  72    Director                                     1998
Katsuhiko Kobayashi(3)....................  52    Director                                     1999
Satoru Ohya...............................  65    Director                                     2000
Charles H. Still(1)(2)(3).................  55    Director                                     1999
</TABLE>
 
- ---------------
 
(1) To be elected as a director immediately after the closing of the Offering.
 
(2) Member of the Compensation Committee of the Board of Directors.
 
(3) Member of the Audit Committee of the Board of Directors.
 
     GARY D. OWENS joined the Company as President and Chief Executive Officer
in August 1997 and became Chairman of the Board of the Company in September
1997. From October 1993 until May of 1997, Mr. Owens was the President and Chief
Executive Officer of Input/Output. Mr. Owens had held other positions at
Input/Output since 1977. In September 1997, Mr. Owens was named as a defendant
in a lawsuit filed against Input/Output and certain officers of Input/Output.
The lawsuit, which contained a petition for certification as a class action,
alleges, among other things, that false or misleading statements were made in
certain filings Input/Output made with the Securities and Exchange Commission
while Mr. Owens was President, Chief Executive Officer and a director of
Input/Output. Input/Output has assumed the defense of Mr. Owens pursuant to
indemnity provisions afforded to him as a former officer and director of
Input/Output. Input/Output has stated publicly that it believes the allegations
in the lawsuit are without merit and that it intends to defend vigorously the
claims brought against it.
 
     MICHAEL J. SHEEN joined the Company as Vice President and Chief Technical
Officer in August 1997. Mr. Sheen will be elected, and has consented to serve,
as a director immediately after the closing of the Offering. Mr. Sheen had been
a Senior Vice President and Chief Technical Officer of Input/Output since 1991,
and had held other positions at Input/Output since 1977.
 
     THOMAS T. MCENTIRE joined the Company as Chief Financial Officer in
September of 1997. Mr. McEntire had been Financial Controller of APS Holding
Corporation ("APS") since February 1995 and held other senior financial
management positions since joining APS in 1990. Prior to joining APS, Mr.
McEntire held various positions with Coopers & Lybrand L.L.P. from 1982 to 1990.
 
                                       30
<PAGE>   32
 
     ARNOLD PATER has been president of OYO Instruments since April 1993. He has
also been President of OYO Instruments Canada, Inc. since April 1995 and has
been an employee or officer of the subsidiaries of the Company since 1986. From
1972 to 1986, Mr. Pater held various engineering and engineering management
positions with AMF GeoSpace, concentrating on seismic data acquisition system
design. He holds a degree in electrical engineering from Stattliches Polytechnik
in Hanover, Germany.
 
     THOMAS L. DAVIS, PH.D. will be elected, and has consented to serve, as a
director of the Company immediately after the closing of the Offering. He is
Professor of Geophysics at the Colorado School of Mines. Dr. Davis also is
coordinator of the Reservoir Characterization Project, whose objective is to
characterize reservoirs through development and application of 3-D and time
lapse 3-D multicomponent seismology. Dr. Davis consults and lectures worldwide
and has written and co-edited numerous papers and other works in the field of
seismic interpretation.
 
     ERNEST M. HALL, JR. has been a director since the Company's formation in
September 1994. From the Company's formation until his retirement in July 1997,
Mr. Hall was the President and Chief Executive Officer of the Company. He was
President of OYO U.S.A. from 1985 until 1995, and has been re-elected to that
position effective October 1, 1997. From 1980 to 1985, Mr. Hall served as a
consultant to OYO U.S.A.
 
     KATSUHIKO KOBAYASHI has been Joint General Manager of OYO Japan since May
1995. From 1973 to 1995 he was employed by Sanwa Bank in its international
banking area, where he last held the position of general manager of the
International Credit Administration Department from 1993 to 1995.
 
     SATORU OHYA, who is a geologist by education at Tokyo University, was
Chairman of the Board from the Company's formation in September 1994 until
September 1997, and continues as a director of the Company. He has been
President of OYO Japan since 1993. For approximately 40 years, Mr. Ohya has been
an employee or officer of OYO Japan and various of its affiliates, including
serving as Chief Executive Officer of the Company's predecessors from 1983 to
1994.
 
     CHARLES H. STILL will be elected, and has consented to serve, as a director
of the Company immediately after the closing of the Offering and has been
Secretary since the Company's formation in September 1994 and Secretary of
various affiliates and predecessors of the Company since 1980. He has been a
partner in the law firm of Fulbright & Jaworski L.L.P. since 1975.
 
COMMITTEES
 
     The Board of Directors of the Company has established an Audit Committee
and a Compensation Committee. The Audit Committee is charged with recommending
to the Board of Directors the appointment of the Company's independent auditors,
reviewing the compensation of such auditors and reviewing with such accountants
the plans for and the results and scope of their auditing engagement. The
Compensation Committee reviews the performance and compensation of directors,
executive officers and key employees and makes recommendations to the Board of
Directors with respect thereto. It also administers the Company's 1997 Key
Employee Stock Option Plan. See "-- Key Employee Stock Option Plan."
 
COMPENSATION OF DIRECTORS
 
     Directors of the Company currently are not compensated for their services
as directors. All non-employee directors of the Company are reimbursed, however,
for ordinary and necessary expenses incurred in attending Board or committee
meetings. The Company, however, intends to begin compensating non-employee
directors for their services at a rate of $25,000 per year, of which one-half
will be payable in shares of Common Stock based on the fair market value thereof
at the date of issuance pursuant to the Company's 1997 Non-Employee Director
Stock Plan. The Company anticipates that Messrs. Hall, Kobayashi and Ohya will
not accept this annual stipend or any stock options. Contemporaneously with the
Offering, the Company intends to grant options to each non-employee director to
acquire 6,300 shares of Common Stock at an exercise price equal to the per share
price to the public for Common Stock to be acquired in the Offering as set forth
on the cover page of this Prospectus. Thereafter, the Company will make an
annual grant of an option to acquire 3,150 shares of Common Stock to each
non-employee director serving on the Board of Directors following each annual
meeting of the stockholders.
 
                                       31
<PAGE>   33
 
COMPENSATION OF EXECUTIVE OFFICERS
 
     The following table sets forth information with respect to the current
President and Chief Executive Officer of the Company and the former President
and Chief Executive Officer of the Company (the "Named Executive Officers"). No
other executive officer of the Company or a subsidiary of the Company received
compensation in the year ended September 30, 1997 that exceeded $100,000.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                       ANNUAL COMPENSATION
                                                                  YEAR ENDED SEPTEMBER 30, 1997
                                                              -------------------------------------
                          NAME AND                                                     ALL OTHER
                     PRINCIPAL POSITION                        SALARY     BONUS     COMPENSATION(1)
                     ------------------                       --------   --------   ---------------
<S>                                                           <C>        <C>        <C>
Gary D. Owens
  Chairman of the Board, President and Chief Executive
  Officer(2)................................................  $ 29,167         --            --
Ernest M. Hall, Jr.
  Former President and Chief Executive Officer(2)...........   200,000   $300,000(3)     $ 4,745
</TABLE>
 
- ---------------
 
(1) Represents contributions by the Company under the Company's 401(k) savings
    plans.
 
(2) Mr. Hall retired from the offices of President and Chief Executive Officer
    effective July 31, 1997. Mr. Owens was appointed to those offices effective
    August 1, 1997.
 
(3) In lieu of a bonus, Mr. Hall was paid a $300,000 fee pertaining to the
    recovery of amounts previously written off as bad debt.
 
KEY EMPLOYEE STOCK OPTION PLAN
 
     The Company has established an incentive stock option and restricted stock
plan, the OYO Geospace Corporation 1997 Key Employee Stock Option Plan (the
"Employee Plan"), pursuant to which options to purchase shares of Common Stock
and awards of restricted shares of Common Stock will be available for future
grant.
 
     The Employee Plan is designed to provide key employees, including officers
and employee-directors of the Company, with additional incentives to promote the
success of the Company's business and to enhance the Company's ability to
attract and retain the services of qualified persons. The Employee Plan will be
administered by the Compensation Committee or such other committee of no less
than two persons (the "Committee") appointed by the Board of Directors.
Committee members may not be employees of the Company and must not have been
eligible to participate under the Employee Plan for a period of at least one
year prior to being appointed to the Committee. Under the Employee Plan, options
to purchase Common Stock and restricted stock awards up to an aggregate of
425,000 shares of Common Stock may be granted by the Committee. The maximum
number of shares subject to stock options that may be issued to any employee
under the Employee Plan in any calendar year is 400,000. The exercise price of
an option granted pursuant to the Employee Plan may not be less than the fair
market value of the Common Stock on the date of grant and is determined by the
Committee on the date the option is granted. In the case of a grant of an option
designated as an "Incentive Option" (as defined in the Employee Plan) to an
employee who owns ten percent or more of the outstanding shares of Common Stock
(a "10% Stockholder"), the exercise price of each such option under the Employee
Plan may not be less than 110% of the fair market value of the Common Stock on
the date of the grant. No option may be granted under the Employee Plan for a
period of more than ten years. In the case of a 10% Stockholder, no option
designated as an Incentive Option may be granted for a period of more than five
years. Options designated as Incentive Options under the Employee Plan may not
be granted to the extent the aggregate fair market value of the stock, valued as
of the date of the grant, with respect to which options first are exercisable by
the option holder in any calendar year, under the Employee Plan or any other
incentive stock option plan of the Company, exceeds $100,000. Under the Employee
Plan, the Committee may issue shares of restricted stock to employees for no
payment by the employee or for a payment below the fair market value on the date
of grant. The restricted stock is subject to certain restrictions described in
the Employee Plan, with no restrictions continuing for more than ten years from
the date of the award.
 
                                       32
<PAGE>   34
 
     To date, no options or restricted stock awards have been granted under the
Employee Plan. In connection with the Offering, the Company intends to grant
options to purchase an aggregate of approximately 200,000 shares of Common Stock
and make restricted stock awards for an aggregate of approximately 90,000 shares
of Common Stock to certain officers and key employees. These officers and
employees will not be required to make any payment for any restricted stock
awards, which vest over four years in 25% increments. Restrictions on transfer
and forfeiture provisions upon termination of employment will apply to the
restricted stock covered by the awards. After the restrictions lapse, the stock
will be owned by the employees free of further restrictions under the Employee
Plan.
 
     In the 1993 Omnibus Budget Reconciliation Act ("OBRA"), Congress generally
limited to $1.0 million per year the tax deduction available to public companies
for certain compensation paid to designated executives. These executives include
the Chief Executive Officer and the next four highest compensated officers of
the Company. An exception is provided from this deduction limitation, for
"performance-based" compensation, if specified statutory requirements are
satisfied. The Plan is generally designed to satisfy these statutory
requirements for stock options. The Company anticipates being entitled to deduct
an amount equal to the ordinary income reportable by an optionee on exercise of
nonqualified options and the early disposition of shares of stock acquired by
exercise of incentive stock options. Restricted stock awards become vested based
on service to the Company, and generally will not be exempt from the $1.0
million deduction cap. Because of special transition rules applicable to
companies which first become public in an initial public offering, the Company
does not anticipate that application of this deduction cap will have a material
impact on awards issued under this Plan.
 
     The Employee Plan may be amended by the Board of Directors without any
requirement of stockholder approval, except that, to the extent required to
maintain the status of any incentive option under the Internal Revenue Code of
1986, no amendment that would (a) change the aggregate number of shares of stock
which may be issued under incentive options, (b) change the class of employees
eligible to receive incentive options, or (c) decrease the option price for
incentive options below the fair market value of the stock at the time it is
granted shall be made without the approval of the Company's stockholders.
 
DIRECTOR STOCK PLAN
 
   
     The Company has established the Oyo Geospace Corporation 1997 Non-Employee
Director Plan (the "Director Plan"), pursuant to which options to purchase
shares of Common Stock will be available for future grant to non-employee
directors and pursuant to which one-half of the annual fees paid for the
services of such non-employee directors (currently $25,000 per year) will be
paid in shares of Common Stock based on the fair market value thereof, as
determined under the Director Plan, at the date of grant. The Company
anticipates that Messrs. Hall, Kobayashi and Ohya will not accept this annual
stipend. The Director Plan is designed to enhance the Company's ability to
attract and retain the services of qualified persons as directors and to provide
such directors with a direct proprietary interest in the success of the Company.
The Director Plan will be administered by the Board of Directors of the Company.
Under the Director Plan, an aggregate of 75,000 shares of Common Stock will be
available for grant of options to purchase Common Stock and for issuance in
partial payment of directors' annual fees. The exercise price of an option
granted pursuant to the Director Plan may not be less than the fair market value
of the Common Stock on the date of grant and is determined by the Board of
Directors on the date the option is granted. No option may be granted under such
Plan for a period of more than ten years. Shares issued to directors in payment
of part of their annual fees shall be issued based on the fair market value
thereof on the date of issuance.
    
 
     To date, no options have been granted under the Director Plan and no shares
have been issued under such plan in respect of director fees. In connection with
the Offering, the Company intends to grant options to each non-employee director
other than Messrs. Hall, Kobayashi and Ohya to acquire 6,300 shares of Common
Stock at an exercise price equal to the initial public offering price of the
Common Stock to be acquired in the Offering as set forth on the cover page of
this Prospectus. Thereafter, the Director Plan provides for the annual grant of
an option to acquire 3,150 shares of Common Stock to those non-employee
directors who are serving on the Board of Directors following the annual meeting
of the stockholders. The Director Plan generally may be amended by the Board of
Directors without any requirement of stockholder approval.
 
                                       33
<PAGE>   35
 
401(K) PLAN
 
     The Company has adopted a new 401(k) Plan (the "401(k) Plan"), effective as
of the closing of the Offering, under which substantially all employees of the
Company and its subsidiaries who have completed at least six months of service
will be eligible to participate. The 401(k) Plan permits eligible employees to
contribute up to 17 percent of their annual compensation up to a maximum dollar
amount established in accordance with Section 401(k) of the Internal Revenue
Code of 1986. The Company may, in its discretion, make matching contributions of
up to 50 percent of the employees' deferrals of up to six percent of their
compensation. During the fiscal year ended September 30, 1997, the Company made
matching contributions under a 401(k) plan sponsored by OYO U.S.A. in an
aggregate amount of $4,745 for the Named Executive Officers.
 
INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
     The Company's Restated Certificate of Incorporation provides that the
liability of the directors for monetary damages shall be limited to the fullest
extent permissible under Delaware law.
 
     The Company's Bylaws indemnify its directors and officers to the fullest
extent possible under Delaware law. These indemnification provisions require the
Company to indemnify such persons against certain liabilities and expenses to
which they may become subject by reason of their service as a director or
officer of the Company or any of its affiliated enterprises. The provisions also
set forth certain procedures, including the advancement of expenses, that apply
in the event of a claim for indemnification. The Company intends to enter into
indemnification agreements with each of the directors of the Company, pursuant
to which the Company will indemnify each such director to the fullest extent
permitted by law. The Company also intends to obtain insurance to protect its
officers and directors from liability.
 
EMPLOYMENT AGREEMENTS
 
     Each of Messrs. Owens and Sheen (each individually an "Employee") has
entered into an employment agreement (each individually an "Employment
Agreement") with the Company. Mr. Owens' base annual salary is $175,000, and Mr.
Sheen's base annual salary is $150,000, in each case subject to adjustment by
the Board of Directors of the Company. Each of the Employees also is entitled to
participate in the 401(k) Plan and any bonus plan the Company adopts and to
receive certain employee benefits and vacation.
 
     Each Employment Agreement provides that the Employee will receive the
severance benefits described below upon termination of the Employee's employment
unless the termination (a) results from the death, disability or retirement of
the Employee, (b) is by the Company for Cause (as defined in the Employment
Agreement) or (c) is by the Employee other than for Good Reason (as defined in
the Employment Agreement). Under the Employment Agreements, "Cause" is defined
to mean the Employee's willful and continued failure to perform his duties after
a demand for such performance or the Employee's willfully engaging in gross
misconduct materially and demonstrably injurious to the Company. Under the
Employment Agreements, "Good Reason" is defined to mean a demotion, a reduction
in base salary, a relocation of the Employee's base location of employment, the
discontinuation of any employee benefit without comparable substitution, the
failure of any successor of the Company to assume the Employment Agreement or a
purported termination not in compliance with the Employment Agreement. The
severance benefits to which each Employee would be entitled include (i) his
salary through the date of termination, (ii) twice his base salary and pro-rated
bonus for the fiscal year of termination, (iii) any relocation and indemnity
payments to which he is entitled and any costs and legal fees incurred in
connection with any dispute over the Employment Agreement and (iv) a gross-up
for any applicable "excess parachute payment" tax imposed by the Internal
Revenue Code of 1986.
 
     In the Employment Agreements, each Employee has agreed that he will not
disclose or misappropriate any confidential information of the Company.
 
                                       34
<PAGE>   36
 
              RELATIONSHIP WITH OYO JAPAN AND RELATED TRANSACTIONS
 
     Mr. Ohya, a director of the Company, is President of OYO Japan and Chairman
of the Board of OYO U.S.A. and holds other offices of subsidiaries of OYO U.S.A.
Mr. Kobayashi, also a director of the Company, is the Joint General Manager of
OYO Japan. Mr. Kobayashi also holds offices with many subsidiaries of OYO U.S.A.
Mr. Hall, also a director of the Company, is the President of OYO U.S.A. Mr.
Still, who is to become a director of the Company immediately after the closing
of the Offering, is the Secretary of OYO U.S.A. and also serves in that position
with respect to most of the subsidiaries of OYO U.S.A.
 
     In contemplation of the Offering, the Company received from OYO U.S.A. in
September 1997 to settle various intercompany debts and accounts and an equity
contribution of $4.4 million and a cash contribution of $0.7 million.
 
     In contemplation of the Offering, the Company declared and distributed to
OYO U.S.A. a dividend of all of the outstanding capital stock of TrueTime, Inc.,
a former wholly-owned subsidiary of the Company, effective September 30, 1997.
 
     In September 1997, in contemplation of the Offering, the Company purchased
from two affiliates of OYO U.S.A. several tracts of real property that it
previously had leased from those affiliates and related equipment. These
properties include the Company's manufacturing facilities and related office
space located in Houston, Texas and Calgary, Alberta, Canada. Annual rent for
these facilities for fiscal each of 1995, 1996 and 1997 was approximately
$213,000, plus utilities, taxes, insurance and ordinary maintenance. The
properties were purchased at appraised values aggregating, together with the
equipment, approximately $2.5 million.
 
     During fiscal 1995, 1996 and 1997, the Company paid an aggregate of $0.3
million, $0.3 million and $0.4 million, respectively, in interest to OYO U.S.A.
and its affiliates pursuant to inter-company lending arrangements. As of
September 30, 1997, the Company was not indebted to OYO Japan. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources."
 
     In fiscal 1996 and 1997, the Company purchased printheads for its thermal
plotters from OYO Japan for an aggregate price of approximately $2.8 million and
$2.4 million, respectively, pursuant to a Printhead Purchase Agreement dated
November 10, 1995 (the "Printhead Purchase Agreement"), between the Company and
OYO Japan. In fiscal 1995 prior to the Printhead Purchase Agreement, the Company
purchased approximately $2.8 million in thermal plotters from OYO Japan. OYO
Japan had in turn purchased such printheads primarily from another Japanese
corporation, and to a lesser extent from two other Japanese corporations. For
its service and assistance in such transactions, pursuant to the Printhead
Purchase Agreement, OYO Japan marked up its cost for such printheads by 10% in
reselling them to the Company. The Company believes that, by purchasing the
heads through OYO Japan, it receives a more favorable price for the heads than
could otherwise be obtained if the Company were to negotiate directly for their
purchase. With respect to the two other Japanese companies, the Company believes
it is convenient and facilitates the administrative handling of the purchases to
purchase the printheads from OYO Japan. This arrangement with OYO Japan will be
continued under and pursuant to the terms of the Printhead Purchase Agreement
after the Offering. Under that agreement, the Company will continue to purchase
printheads from OYO Japan at a price equal to 110% of OYO Japan's cost in
acquiring such printheads, and OYO Japan will supply the Company with its
requirements of printheads on those terms. The Printhead Purchase Agreement
automatically renews on a year-to-year basis unless either party provides 90
days notice prior to any annual renewal.
 
     Pursuant to a Master Sales Agreement dated November 10, 1995 (the "Master
Sales Agreement"), the Company and OYO Japan purchase products from one another
at scheduled discounts of 5 to 20 percent off the seller's list prices. In
fiscal 1997, the Company sold approximately $0.6 million in goods to OYO Japan
and its affiliates. In fiscal 1996, the Company purchased approximately $0.8
million in goods from OYO Japan and sold approximately $0.9 million in goods to
OYO Japan. In fiscal 1995, prior to the Master Sales Agreement, the Company sold
approximately $2.0 million in goods to OYO Japan and its affiliates (in each
 
                                       35
<PAGE>   37
 
case excluding the products covered by the Printhead Purchase Agreement). These
transactions reflected discounts of between 20 and 25 percent from list price.
The Company expects that this arrangement will continue under the Master Sales
Agreement following the Offering. The Master Sales Agreement automatically
renews on a year-to-year basis unless either party provides 90 days notice prior
to any annual renewal.
 
     The Company's employee benefit plans and insurance programs have been
administered or combined with affiliated companies under OYO U.S.A.'s control.
The Company has paid its proportionate share of related costs (administration
fees to third parties and premiums). After the effective date of this Offering,
the Company will contract for these services on its own behalf.
 
           SECURITY OWNERSHIP OF MANAGEMENT AND PRINCIPAL STOCKHOLDER
 
     Prior to the Offering, management of the Company owned no shares of Common
Stock. Contemporaneously with the Offering, management of the Company will be
issued options to acquire shares of Common Stock or shares of restricted Common
Stock as set forth below, pursuant to the Employee Plan. See "Management -- Key
Employee Stock Option Plan." The following table sets forth as of the closing of
the Offering beneficial ownership of shares of Common Stock, and as a percentage
of outstanding Common Stock, of each of the Company's directors, each Named
Executive Officer, each beneficial owner of more than 5% of outstanding Common
Stock and all directors and executive officers as a group. Each person named has
sole voting and investment power with respect to the shares indicated except as
otherwise stated in the notes to the table.
 
   
<TABLE>
<CAPTION>
                                                               BENEFICIAL OWNERSHIP
                                                                 AFTER OFFERING(1)
                                                              -----------------------
                  NAME OF BENEFICIAL OWNER                     SHARES      PERCENTAGE
                  ------------------------                    ---------    ----------
<S>                                                           <C>          <C>
OYO Corporation(2)..........................................  3,000,000        59%
OYO Corporation U.S.A.(3)...................................  3,000,000        59
Gary D. Owens(4)............................................     10,000         *
Michael J. Sheen(5).........................................     10,000         *
Thomas L. Davis(6)..........................................         --         *
Ernest M. Hall, Jr..........................................         --         *
Katsuhiko Kobayashi(7)......................................         --         *
Satoru Ohya(8)..............................................  3,000,000        59
Charles H. Still(6).........................................         --         *
                                                              ---------        --
Executive officers and directors as a group (9 people)(9)...  3,029,000        60%
                                                              =========        ==
</TABLE>
    
 
- ---------------
 
 *  Less than one percent.
 
(1) Excludes shares that may be purchased from the Underwriters at the initial
    public offering price. The Underwriters have reserved up to 300,000 shares
    of the Common Stock offered hereby for sale at the initial public offering
    price to directors, officers, employees and business associates of the
    Company and the Selling Stockholder. Mr. Owens has indicated to the Company
    that he currently intends to purchase a substantial number of these reserved
    shares. See "Underwriting."
 
(2) The shares indicated as beneficially owned by OYO Corporation are held
    directly by its wholly-owned subsidiary OYO Corporation U.S.A. The address
    of OYO Corporation is Ichigay Building 2-6, Kudan-kita 4-chome, Chiyoda-ku,
    Tokyo 102, Japan.
 
(3) The address of OYO Corporation U.S.A. is 7334 N. Gessner Road, Houston,
    Texas 77040.
 
(4) Includes 10,000 shares of restricted stock to be granted pursuant to the
    Employee Plan in connection with the Offering. Does not include options to
    purchase 20,000 shares of Common Stock to be granted pursuant to the
    Employee Plan in connection with the Offering, which are not exercisable
    within 60 days.
 
(5) To be elected as a director immediately after the closing of the Offering.
    Includes 10,000 shares of restricted stock to be granted pursuant to the
    Employee Plan in connection with the Offering. Does not
 
                                       36
<PAGE>   38
 
    include options to purchase 20,000 shares of Common Stock to be granted
    pursuant to the Employee Plan in connection with the Offering, which are not
    exercisable within 60 days.
 
(6) To be elected as a director immediately after the closing of the Offering.
    Does not include options to purchase 6,300 shares of Common Stock to be
    granted pursuant to the Director Plan in connection with the Offering, which
    are not exercisable within 60 days.
 
(7) Mr. Kobayashi owns 2,420 ordinary shares of OYO Corporation.
 
(8) The Shares indicated as beneficially owned by Mr. Ohya are owned directly by
    OYO U.S.A. and are included because of Mr. Ohya's affiliation with OYO
    Japan. Mr. Ohya disclaims beneficial ownership of the shares of Common Stock
    owned by OYO U.S.A. within the meaning of Rule 13d-3 under the Exchange Act.
    Mr. Ohya owns 311,300 ordinary shares of OYO Corporation, and his wife and
    children collectively own 10,741 ordinary shares of OYO Corporation. Mr.
    Ohya disclaims beneficial ownership of the shares of OYO Corporation owned
    by his children within the meaning of Rule 13d-3 under the Exchange Act.
 
   
(9) See notes (1) and (4) through (8) above. Also includes an additional 9,000
    shares of restricted stock to be granted pursuant to the Employee Plan in
    connection with the Offering.
    
 
                              SELLING STOCKHOLDER
 
   
     Of the Shares being offered hereby, 1,000,000 are being offered by the
Selling Stockholder. Prior to the Offering, the Company has been a wholly-owned
subsidiary of the Selling Stockholder. See "Relationship with OYO Japan and
Related Transactions." Following the Offering, the Selling Stockholder will hold
3,000,000 shares of Common Stock, which will constitute approximately 59% of the
outstanding shares of Common Stock (or 2,850,000 shares and 55% if the
Underwriters' over-allotment option is exercised in full). The Company and the
Selling Stockholder will proportionately share the underwriting discount and the
expenses of the Offering.
    
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The following is a summary of certain provisions of the Restated
Certificate of Incorporation and the Bylaws of the Company which are included as
exhibits to the registration statement of which this Prospectus forms a part.
 
AUTHORIZED AND OUTSTANDING CAPITAL STOCK
 
     The authorized capital stock of the Company consists of 20,000,000 shares
of Common Stock, par value $.01 per share, and 1,000,000 shares of Preferred
Stock, par value $.01 per share (the "Preferred Stock"). As of the date of this
Prospectus, 4,000,000 shares of Common Stock were issued and outstanding
(adjusted to give retroactive effect to the Stock Split) and held by one
stockholder of record. A total of 500,000 shares of Common Stock will be granted
as restricted stock or reserved for grants of options and restricted stock
awards under the Employee Plan and the Director Plan. No shares of Preferred
Stock have been issued.
 
COMMON STOCK
 
     The holders of the Common Stock are entitled to one vote per share in the
election of directors and on all other matters on which stockholders are
entitled or permitted to vote. Such holders are not entitled to vote
cumulatively for the election of directors. Holders of Common Stock have no
redemption, conversion, preemptive or other subscription rights. Each share of
Common Stock entitles the holder thereof to one vote at all meetings of the
stockholders of OYO Geospace. The holders of Common Stock are not able to act by
written consent. The Bylaws provide that special meetings of stockholders may be
called only by the Board of Directors. The Common Stock has been approved for
inclusion in the Nasdaq National Market under the symbol "OYOG."
 
                                       37
<PAGE>   39
 
     In the event of the liquidation, dissolution or winding up of the Company,
holders of Common Stock are entitled to share ratably in all of the assets of
the Company remaining, if any, after satisfaction of the debts and liabilities
of the Company and the preferential rights of the holders of the preferred
stock, if any, then outstanding. The outstanding shares of Common Stock are, and
the shares of Common Stock offered hereby will be, upon payment therefor as
contemplated herein, validly issued, fully paid and nonassessable. The Company
is subject to certain restrictions on payments to the holders of its Common
Stock under the provisions of its revolving credit facility.
 
PREFERRED STOCK
 
     Preferred Stock may be issuable in one or more series from time to time at
the discretion of the Board of Directors. The Board of Directors is authorized
to fix the respective designations, relative rights, preferences,
qualifications, restrictions and limitations of each series. The issuance of
Preferred Stock could be used as an "anti-takeover" device without requiring
further action on the part of the holders of Common Stock.
 
INDEMNIFICATION OF DIRECTORS AND OFFICERS AND LIMITATION OF DIRECTOR LIABILITY
 
     The Restated Certificate of Incorporation contains provisions that
eliminate the personal liability of its directors for monetary damages resulting
from breaches of their fiduciary duty other than liability for breaches of the
duty of loyalty, acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, any unlawful payment of a
dividend or unlawful stock purchase or redemption under Section 174 of the
Delaware General Corporation Law or any transaction from which the director
derived an improper personal benefit. The Restated Certificate of Incorporation
contains provisions requiring the indemnification of the Company's directors and
officers to the fullest extent permitted by the Delaware General Corporation
Law, including circumstances in which indemnification is otherwise
discretionary. The Company intends to enter into Indemnification Agreements with
each of its directors and certain officers on the day before the closing of the
Offering. The Company believes that these provisions are necessary to attract
and retain qualified persons as directors and officers.
 
CLASSIFIED BOARD OF DIRECTORS
 
     The Restated Certificate of Incorporation provides that the Board of
Directors shall be divided into three classes, the members of which will serve
staggered three-year terms. The Company believes that a classified board of
directors could help to assure the continuity and stability of the Board's and
the Company's business strategies and policies as determined by the Board of
Directors. The classified board provision could have the effect of making the
removal of incumbent directors more time-consuming and, therefore, discouraging
a third party from making a tender offer or otherwise attempting to obtain
control of the Company, even though such an attempt might be beneficial to the
Company and its stockholders. Thus, the classified board provision could
increase the likelihood that incumbent directors would retain their positions.
In addition, the Restated Certificate of Incorporation provides that directors
may be removed from office only "for cause" (as defined therein). Subject to
rights of any holders of preferred stock, newly created directors and vacancies
on the Board of Directors will be filled solely by the remaining directors then
in office.
 
ADVANCE NOTICE PROVISIONS FOR CERTAIN STOCKHOLDER ACTIONS
 
     The Bylaws establish an advance notice procedure with regard to the
nomination, other than by or at the direction of the Board or a committee
thereof, of candidates for election as directors (the "Nomination Procedure")
and with regard to certain matters to be brought before an annual meeting of
stockholders of the Company (the "Business Procedure").
 
     Under the Business Procedure, a stockholder seeking to have any business
conducted at an annual meeting must give prior written notice, in proper form,
to the Secretary of the Company. The requirements as to the form and timing of
that notice are specified in the Bylaws. If the Chairman or other officer
presiding at a meeting determines that other business was not properly brought
before such meeting in accordance with the Business Procedure, such business
will not be conducted at the meeting.
 
                                       38
<PAGE>   40
 
     The Nomination Procedure requires that a stockholder give prior written
notice, in proper form, of a planned nomination for the Board to the Secretary
of the Company. The requirements as to the form and timing of that notice are
specified in the Bylaws. If the election inspectors determine that a person was
not nominated in accordance with the Nomination Procedure, such person will not
be eligible for election as a director.
 
     Although the Bylaws do not give the Board any power to approve or
disapprove stockholder nominations for the election of directors or of any other
business desired by stockholders to be conducted at an annual or any other
meeting, the Bylaws (i) may have the effect of precluding a nomination for the
election of directors or precluding the conduct of business at a particular
annual meeting if the proper procedures are not followed, or (ii) may discourage
or deter a third party from conducting a solicitation of proxies to elect its
own slate of directors or otherwise attempting to obtain control of the Company,
even if the conduct of such solicitation or such attempt might be beneficial to
the Company and its stockholders.
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
     Upon completion of the Offering, OYO Japan, through its wholly-owned
subsidiary OYO U.S.A., will own approximately 59% of the outstanding Common
Stock (55% if the Underwriters' over-allotment option is exercised in full).
    
 
     OYO Japan and the Selling Stockholder, as well as the officers and
directors of the Company, have agreed pursuant to "lock-up" agreements that they
will not, without the prior written consent of the Underwriters, offer, sell,
contract to sell or grant any option to purchase or otherwise dispose of any
shares of Common Stock or any options exercisable for Common Stock for a period
of 120 days after the date of this Prospectus, other than the shares of Common
Stock to be sold to the Underwriters in the Offering. See "Underwriting."
 
   
     Upon completion of the Offering, the Company will have 5,068,000 shares of
Common Stock outstanding (5,218,000 shares if the Underwriters' over-allotment
option is exercised in full). Of these shares, the 2,000,000 shares of Common
Stock sold in the Offering (2,300,000 shares if the Underwriters' over-allotment
option is exercised in full) will be freely tradeable in the public market
without restriction by persons other than affiliates of the Company. The
remaining 3,068,000 shares of Common Stock outstanding (2,918,000 if the
Underwriters' over-allotment option is exercised in full) will be "restricted
securities" within the meaning of Rule 144 under the Securities Act of 1933 (the
"Securities Act"). Consequently, such shares may not be resold unless they are
registered under the Securities Act or resold pursuant to an applicable
exemption from registration under the Securities Act, such as Rule 144.
    
 
     The Company intends to file a registration statement on Form S-8 under the
Securities Act to register all of the shares of Common Stock then reserved for
future issuance under the Employee Plan and the Director Plan. Shares acquired
under such plan after the effective date of the registration statement generally
will be available for resale by non-affiliates in the public market. Shares
acquired by affiliates under such plan may not be resold unless they are
registered under the Securities Act or resold pursuant to an applicable
exemption from such registration, such as Rule 144.
 
     The Company believes that all of the outstanding shares of Common Stock
will be immediately tradeable in accordance with the provisions of Rule 144 upon
expiration of the lock-up agreements described above. In general, under Rule 144
as currently in effect, a person (or persons whose shares are required to be
aggregated) who has been deemed to have beneficially owned, for at least one
year, shares of Common Stock that have not been registered under the Securities
Act or that were acquired from an "affiliate" of the Company, is entitled to
sell within any three-month period a number of shares of Common Stock that does
not exceed the greater of 1% of the number of then outstanding shares of Common
Stock (approximately 51,000 shares upon completion of the Offering if the
Underwriters' over-allotment option is not exercised) and the average weekly
reported trading volume in the Common Stock during the four calendar weeks
preceding such sale. Sales under Rule 144 also are subject to certain notice and
manner-of-sale requirements and to the availability of current public
information about the Company. A person (or persons whose shares are
 
                                       39
<PAGE>   41
 
aggregated) who is not an "affiliate" of the Company during the three months
prior to resale and who has been deemed to have beneficially owned such shares
for at least two years is entitled to sell such shares under Rule 144 without
regard to the requirements discussed above.
 
     The Company has agreed that, for a period of 120 days after the date of the
closing of the Offering, it will not, directly or indirectly, offer, sell,
contract to sell, grant any option to sell or otherwise dispose of any shares of
Common Stock (or any securities convertible into or exercisable or exchangeable
for, any rights to purchase or acquire, Common Stock, other than options under
the Employee Plan and the Director Plan) without the prior written consent of
the Underwriters.
 
     Prior to the Offering, there has been no public market for the Common Stock
and no prediction can be made as to the effect, if any, that sales of shares of
Common Stock or the availability of such shares for sale will have on the market
price of the Common Stock prevailing from time to time. Nevertheless, sales of
substantial amounts of Common Stock in the public market could adversely affect
prevailing market prices.
 
                                       40
<PAGE>   42
 
                                  UNDERWRITING
 
     The Underwriters named below (the "Underwriters") have severally agreed,
subject to the terms and conditions of the Underwriting Agreement, to purchase
from the Company and OYO U.S.A. the number of shares of Common Stock set forth
opposite their respective names below at the public offering price less the
underwriting discount set forth on the cover page of this Prospectus. The nature
of the obligations of the Underwriters is such that if any of the Shares are
purchased, all must be purchased.
 
<TABLE>
<CAPTION>
                                                               NUMBER
                        UNDERWRITERS                          OF SHARES
                        ------------                          ---------
<S>                                                           <C>
Rauscher Pierce Refsnes, Inc. ..............................
Raymond James & Associates, Inc. ...........................
                                                              ---------
          Total.............................................  2,000,000
                                                              =========
</TABLE>
 
     The Underwriters propose initially to offer the Shares to the public at the
initial public offering price set forth on the cover page of this Prospectus.
The Underwriters may allow a concession to selected dealers who are members of
the National Association of Securities Dealers, Inc. ("NASD") not in excess of
$          per share, and the Underwriters may allow, and such dealers may
reallow, to members of the NASD a concession not in excess of $          per
share. After the initial public offering, the price to public, the concession
and the reallowance may be changed by the Underwriters.
 
     Each of the Company and the Selling Stockholder has granted an option to
the Underwriters, exercisable within 30 days after the date of this Prospectus,
to purchase up to an additional 150,000 shares of Common Stock (an aggregate of
300,000 shares) at the initial public offering price, less the underwriting
discount set forth on the cover page of this Prospectus. The Underwriters may
exercise the option only for the purpose of covering over-allotments. To the
extent that the Underwriters exercise this option, each Underwriter will be
committed, subject to certain conditions, to purchase from the Company and OYO
U.S.A. that number of additional shares of Common Stock that is proportionate to
that Underwriter's initial commitment as indicated in the table above.
 
     The Company, OYO U.S.A. and certain officers and directors of the Company
have agreed that, for a period of 120 days after the date of the closing of the
Offering, they will not, directly or indirectly, offer, sell, contract to sell,
grant any option to sell or otherwise dispose of any shares of Common Stock (or
any securities convertible into or exercisable or exchangeable for, any rights
to purchase or acquire, Common Stock, other than options under the Employee Plan
and the Director Plan) without the prior written consent of the Underwriters.
 
     The Underwriters have informed the Company that they do not intend to
confirm sales to any accounts over which they exercise discretionary authority.
 
     Prior to the Offering, there has been no public trading market for the
Common Stock, and there can be no assurance that an active trading market will
develop or be sustained upon the completion of the Offering. The initial public
offering price of the Shares will be determined by negotiations between the
Company and the Underwriters. The primary factors that will be considered in
determining such initial public offering price will include the history of and
prospects for the industry in which the Company competes, market valuation of
comparable companies, market conditions for public offerings, the history and
prospects for the Company's business, the Company's past and present operations
and earnings and the trend of its earnings, the prospects for future earnings of
the Company, the Company's current financial position, an assessment of the
Company's management, the general condition of the securities markets at the
time of the Offering, the demand for similar securities of comparable companies
and other relevant factors.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities that may be incurred in connection with the Offering, including
liabilities under the Securities Act, or to contribute to payments that the
Underwriters may be required to make in respect thereof. The Company has agreed
to pay the Underwriters an accountable expense allowance of $75,000 upon
consummation of the Offering.
 
                                       41
<PAGE>   43
 
     At the request of the Company, the Underwriters have reserved up to 300,000
shares of the Common Stock offered hereby for sale at the initial public
offering price to directors, officers, employees and business associates of the
Company and the Selling Stockholder. Mr. Owens has indicated to the Company that
he currently intends to purchase a substantial number of these reserved shares.
The number of shares available to the general public will be reduced to the
extent these persons purchase the reserved shares. Any reserved shares that are
not so purchased will be offered by the Underwriters to the general public on
the same basis as the other shares offered hereby.
 
     In connection with the Offering, the Underwriters may purchase and sell
Common Stock in the open market. The transactions may include over-allotment and
stabilization transactions and purchases to cover syndicate short positions
created in connection with the Offering. Stabilizing transactions consist of
certain bids or purchases for the purpose of preventing or retarding a decline
in the market price of the Common Stock, and syndicate short positions involve
the sale by the Underwriters of a greater number of shares of Common Stock than
they are required to purchase from the Selling Stockholder and the Company in
the Offering. The Underwriters also may impose a penalty bid, whereby selling
concessions allowed to syndicate members or other broker-dealers in respect of
the shares of Common Stock sold in the Offering for their account may be
reclaimed by the syndicate if such shares of Common Stock are repurchased by the
syndicate in stabilizing or covering transactions. These activities may
stabilize, maintain or otherwise affect the market price of the Common Stock,
which may be higher than the price that might otherwise prevail in the open
market, and these activities, if commenced, may be discontinued at any time.
These transactions may be effected on the Nasdaq National Market, in the
over-the-counter market or otherwise.
 
                                 LEGAL MATTERS
 
     Certain legal matters with respect to the Common Stock have been passed
upon for the Company and the Selling Stockholder by Fulbright & Jaworski L.L.P.,
Houston, Texas. Charles H. Still, a partner of Fulbright & Jaworski L.L.P., is
Secretary of the Company and will become a director of the Company immediately
after closing of the Offering. Certain legal matters in connection with the
Offering will be passed upon for the Underwriters by Vinson & Elkins L.L.P.,
Houston, Texas.
 
                                    EXPERTS
 
     The consolidated financial statements and financial statement schedule of
OYO Geospace Corporation and Subsidiaries at September 30, 1996 and 1997, and
for each of the three years in the period ended September 30, 1997, included in
this Prospectus have been included herein in reliance on the reports of Coopers
& Lybrand L.L.P., independent accountants, given upon the authority of such firm
as experts in accounting and auditing.
 
                             AVAILABLE INFORMATION
 
     Prior to the Offering, the Company has not been subject to the reporting
requirements of the Securities Exchange Act of 1934 (the "Exchange Act"). The
Company intends to furnish its stockholders with annual reports containing
audited consolidated financial statements examined and reported on, with an
opinion expressed by, independent public accountants following the end of each
fiscal year and such interim reports as it may determine to be necessary or
desirable.
 
     OYO Geospace has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-1 (the "Registration
Statement") under the Securities Act with respect to the Shares and the
Offering. This Prospectus, which constitutes a part of the Registration
Statement, does not contain all of the information contained in the Registration
Statement and in the exhibits and schedules thereto, certain portions of which
are omitted as permitted by the rules and regulations of the Commission. For
further information with respect to the Company and the Shares, reference is
made to the Registration Statement, including the exhibits thereto.
 
     The Registration Statement and the exhibits and schedules thereto may be
inspected, without charge, and copies may be obtained at prescribed rates at the
Public Reference Section of the Commission at Room 1024, 450 Fifth Street, N.W.,
Judiciary Plaza, Washington, D.C. 20549, and at the regional offices of the
Commission at Citicorp Center, 500 West Madison Street, 14th Floor, Chicago,
Illinois 60661 and Seven
 
                                       42
<PAGE>   44
 
World Trade Center, 13th Floor, New York, New York 10048. The Commission
maintains a web site that contains reports, proxy and information statements and
other information regarding registrants that file electronically with the
Commission. This web site can be visited at http://www.sec.gov.
 
                                       43
<PAGE>   45
 
                                    GLOSSARY
 
AIR GUN -- a seismic energy source that injects a bubble of highly compressed
  air into the water.
 
ANALOG -- 1. a continuous physical variable (such as voltage) that bears a
  direct relationship to another variable (such as motion of the earth) so that
  one is proportional to the other; 2. continuous, as opposed to discrete or
  digital.
 
BIT -- a binary digit, the smallest unit of information necessary to distinguish
  between two choices such as 0 and 1, on and off, etc.
 
BOREHOLE SEISMOLOGY -- the process of generating and/or recording seismic waves
  in existing well bores.
 
CHANNEL -- a single series of interconnected devices through which data can flow
  from source to recorder.
 
DAS-1 -- the model designation for the Company's small data recorder with a
  channel capacity of up to 144 channels and featuring 24-bit recording
  capability.
 
DIGITAL FIELD MONITOR OR FIELD CAMERA -- an instrument normally located at the
  central recorder that converts digitized seismic data into a visible pattern
  representing electrical signals.
 
DPI -- dots per inch.
 
GEO-ENGINEERING -- analyses of the interaction of ground and structural factors.
 
GEOPHONE -- an instrument used to transform seismic energy into an electrical
  voltage.
 
GEOPHONE STRING CONNECTOR -- a specialized electrical connector attached to the
  end of a geophone string for the purpose of electrical interconnection into
  the seismic recording system.
 
HYDROPHONE -- a seismic sensor used in water covered areas that generates a
  voltage in response to variations in pressure caused by seismic waves.
 
LEADER WIRE -- electrically conductive cable used to interconnect geophones.
 
LITHOLOGY -- the character of a rock formation or a geological strata.
 
NIBS -- very small resistors closely spaced to control the heating of thermally
  sensitive media in a manner that produces a high resolution image.
 
PIEZOELECTRIC MATERIALS -- dielectric materials that generate a voltage in
  response to stress.
 
RASTERIZED DATA -- data obtained by scanning along narrowly spaced lines in both
  a horizontal and vertical direction to determine whether the document is
  either black or white at each crossing of the narrowly spaced lines, similar
  to scanning an area with the sweep of a beam of a television tube.
 
SEISMIC -- having to do with energy waves transmitted through the body of an
  elastic solid.
 
SEISMIC IMPEDANCE -- the product of the density and velocity (acoustic
  impedance) of the subsurface strata.
 
SEISMIC REFLECTION -- the energy or wave from a seismic source that has been
  reflected from an acoustic impedance contrast or series of contrasts within
  the earth.
 
SEISMIC WAVE -- an elastic disturbance which is propagated from point to point
  through the earth.
 
TELEMETRIC CABLE -- cable used to transmit digitized seismic data to the central
  recording unit.
 
THERMAL IMAGING -- a process whereby the heating of thermally sensitive media is
  controlled to graphically present data or images.
 
THREE-AXIS SEISMIC DATA ACQUISITION -- the acquisition of seismic data on three
  axes to determine permeability and porosity of formations.
 
TIME LAPSE 3-D SEISMIC DATA ACQUISITION -- the acquisition of 3-D seismic data
  repeated in the same area over time in order to track fluid movement in a
  reservoir.
 
                                       44
<PAGE>   46
 
TRACE -- a record of one seismic channel.
 
VIBRATOR -- a controlled mechanical oscillator used to generate a controlled
  wave train of seismic energy.
 
VIBROSEIS -- an energy source whereby acoustic waves are mechanically produced
  by machinery that vibrates on the earth's surface.
 
WELL LOG DATA -- indirect measurements of certain properties of subsurface
  strata.
 
WIDE FORMAT THERMAL PLOTTER -- a thermal plotter capable of producing wide
  displays by thermal imaging, usually 24 inches or wider.
 
                                       45
<PAGE>   47
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Accountants...........................   F-2
Consolidated Balance Sheets as of September 30, 1996 and
  1997......................................................   F-3
Consolidated Statements of Operations For The Years Ended
  September 30, 1995, 1996 and 1997.........................   F-4
Consolidated Statement of Stockholder's Equity For The Years
  Ended September 30, 1995, 1996 and 1997...................   F-5
Consolidated Statements of Cash Flows For The Years Ended
  September 30, 1995, 1996 and 1997.........................   F-6
Notes to Consolidated Financial Statements..................   F-7
</TABLE>
 
                                       F-1
<PAGE>   48
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
Board of Directors
OYO Geospace Corporation and Subsidiaries:
 
     We have audited the accompanying consolidated balance sheets of OYO
Geospace Corporation (a wholly-owned subsidiary of OYO Corporation U.S.A.) and
Subsidiaries as of September 30, 1996 and 1997, and the related consolidated
statements of operations, stockholder's equity and cash flows for each of the
three years in the period ended September 30, 1997. These financial statements
are the responsibility of the Company's management. Our responsibility is to
express an opinion on these financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform our audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of OYO Geospace
Corporation and Subsidiaries as of September 30, 1996 and 1997, and the
consolidated results of their operations and their cash flows for each of the
three years in the period ended September 30, 1997, in conformity with generally
accepted accounting principles.
 
     As discussed in Note 1, the accompanying financial statements exclude the
accounts of TrueTime, Inc., formerly a wholly-owned subsidiary that was
distributed to OYO Corporation U.S.A. on September 30, 1997.
 
                                          COOPERS & LYBRAND L.L.P.
 
Houston, Texas
November 3, 1997
 
                                       F-2
<PAGE>   49
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
<S>                                                           <C>         <C>
Current assets:
  Cash and cash equivalents.................................   $   780     $ 2,488
  Receivables:
     Trade accounts and current portion of notes, net of
      allowance $1,064 and $771.............................     5,566       6,308
     Related parties........................................       179         186
  Inventories...............................................    12,864      15,035
  Deferred income tax.......................................       962       1,115
  Prepaid expenses and other................................        92         132
                                                               -------     -------
          Total current assets..............................    20,443      25,264
Rental equipment, net.......................................     1,279       2,394
Property, plant and equipment, net..........................     2,746       6,108
Trade notes receivable -- long-term portion.................        --          30
Goodwill, net of accumulated amortization of $249 and
  $282......................................................     1,038       1,006
Deferred income tax.........................................       713          --
Other assets................................................        53         276
                                                               -------     -------
          Total assets......................................   $26,272     $35,078
                                                               =======     =======
 
LIABILITIES AND STOCKHOLDER'S EQUITY
 
Current liabilities:
  Notes payable to related parties (1996) and banks (1997),
     current maturities.....................................   $ 3,124     $ 1,500
  Accounts payable:
     Trade..................................................       607       2,019
     Related parties........................................     3,685       1,029
  Accrued expenses and other................................     1,931       3,716
  Income tax payable........................................       378         860
                                                               -------     -------
          Total current liabilities.........................     9,725       9,124
Notes payable to related parties, net of current
  maturities................................................     7,919          --
Deferred income tax.........................................        --         854
                                                               -------     -------
          Total liabilities.................................    17,644       9,978
Commitments and contingencies
Stockholder's equity:
  Preferred stock, 1,000,000 shares authorized, no shares
     issued and outstanding.................................        --          --
  Common stock, $.01 par value, 20,000,000 shares
     authorized, 4,000,000 shares issued and outstanding....        40          40
  Additional paid-in capital................................     4,687       9,785
  Retained earnings.........................................     8,932      15,554
  Receivable from Parent....................................    (4,746)         --
  Cumulative foreign currency translation adjustments.......      (285)       (279)
                                                               -------     -------
          Total stockholder's equity........................     8,628      25,100
                                                               -------     -------
          Total liabilities and stockholder's equity........   $26,272     $35,078
                                                               =======     =======
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                       F-3
<PAGE>   50
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                      YEAR ENDED SEPTEMBER 30,
                                                               ---------------------------------------
                                                                  1995          1996          1997
                                                               -----------   -----------   -----------
<S>                                                            <C>           <C>           <C>
Sales.......................................................   $    32,615   $    30,878   $    41,049
Cost of sales...............................................        18,909        17,278        24,239
                                                               -----------   -----------   -----------
Gross profit................................................        13,706        13,600        16,810
Operating expenses:
  Selling, general and administrative expenses..............         5,854         6,729         8,084
  Research and development expenses.........................         1,988         1,959         2,392
  Bad debt expense (recovery)...............................         1,013         2,860        (4,228)
                                                               -----------   -----------   -----------
         Total operating expenses...........................         8,855        11,548         6,248
                                                               -----------   -----------   -----------
Income from operations......................................         4,851         2,052        10,562
                                                               -----------   -----------   -----------
Other income (expense):
  Interest expense..........................................          (452)         (402)         (606)
  Interest income...........................................           177           137           721
  Other, net................................................          (656)         (201)          (52)
                                                               -----------   -----------   -----------
         Total other income (expense), net..................          (931)         (466)           63
                                                               -----------   -----------   -----------
Income before provision for income taxes....................         3,920         1,586        10,625
Provision for income taxes..................................         1,579           577         4,003
                                                               -----------   -----------   -----------
Net income..................................................   $     2,341   $     1,009   $     6,622
                                                               ===========   ===========   ===========
Net income per share........................................   $       .59   $       .25   $      1.66
                                                               ===========   ===========   ===========
Weighted average shares outstanding as restated for stock
  split.....................................................     4,000,000     4,000,000     4,000,000
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                       F-4
<PAGE>   51
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY
             FOR THE YEARS ENDED SEPTEMBER 30, 1995, 1996 AND 1997
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                         CUMULATIVE
                                                                                           FOREIGN
                                  COMMON STOCK      ADDITIONAL              RECEIVABLE    CURRENCY
                               ------------------    PAID-IN     RETAINED      FROM      TRANSLATION
                                SHARES     AMOUNT    CAPITAL     EARNINGS     PARENT     ADJUSTMENTS    TOTAL
                               ---------   ------   ----------   --------   ----------   -----------   -------
<S>                            <C>         <C>      <C>          <C>        <C>          <C>           <C>
Stockholder's equity, October
  1, 1994....................  4,000,000      40       4,687       5,698      (6,697)         (329)      3,399
Net income...................         --      --          --       2,341          --            --       2,341
Increase in receivable from
  Parent.....................         --      --          --          --         502            --         502
Foreign currency translation
  adjustments................         --      --          --          --          --            (1)         (1)
                               ---------   ------     ------     -------     -------       -------     -------
Stockholder's equity,
  September 30, 1995.........  4,000,000      40       4,687       8,039      (6,195)         (330)      6,241
Net income...................         --      --          --       1,009          --            --       1,009
Distribution to Parent.......         --      --          --        (116)         --            --        (116)
Decrease in receivable from
  Parent.....................         --      --          --          --       1,449            --       1,449
Foreign currency translation
  adjustments................         --      --          --          --          --            45          45
                               ---------   ------     ------     -------     -------       -------     -------
Stockholder's equity,
  September 30, 1996.........  4,000,000      40       4,687       8,932      (4,746)         (285)      8,628
Net income...................                                      6,622                                 6,622
Capital contribution from
  Parent.....................                          5,098                                             5,098
Decrease in receivable from
  Parent.....................                                                  4,746                     4,746
Foreign currency translation
  adjustments................                                                                    6           6
                               ---------   ------     ------     -------     -------       -------     -------
Stockholder's equity,
  September 30, 1997.........  4,000,000      40      $9,785     $15,554     $    --       $  (279)    $25,100
                               =========   ======     ======     =======     =======       =======     =======
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                       F-5
<PAGE>   52
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED SEPTEMBER 30,
                                                               ------------------------
                                                                1995     1996     1997
                                                               ------   ------   ------
<S>                                                            <C>      <C>      <C>
Cash flows from operating activities:
  Net income................................................   $2,341   $1,009   $6,622
  Adjustments to reconcile net income to net cash provided
     by operating activities:
     Deferred income tax....................................        8     (621)   1,482
     Depreciation and amortization..........................      891    1,025    1,470
     Gain on disposal of rental equipment and property,
      plant and
       equipment............................................      (81)    (139)    (101)
     Bad debt expense.......................................    1,013    2,860      205
     Effects of changes in operating assets and liabilities:
       Accounts and notes receivable........................   (3,281)  (1,314)    (984)
       Inventories..........................................   (2,371)  (1,523)  (2,171)
       Prepaid expenses and other assets....................     (113)     107     (268)
       Accounts payable.....................................    2,922     (622)     443
       Accrued expenses and other...........................     (193)    (473)   1,785
       Income tax payable...................................     (327)     176    1,515
                                                               ------   ------   ------
          Net cash provided by operating activities.........      809      485    9,998
                                                               ------   ------   ------
Cash flows from investing activities:
  Proceeds from sale of rental equipment and property, plant
     and
     equipment..............................................      325    1,087      794
  Capital expenditures......................................   (1,391)  (2,063)  (6,396)
  Purchase of subsidiary, net of cash acquired..............       --     (968)      --
                                                               ------   ------   ------
          Net cash used in investing activities.............   (1,066)  (1,944)  (5,602)
                                                               ------   ------   ------
Cash flows from financing activities:
  Increase in notes payable to banks........................       --       --    1,500
  Proceeds received from notes payable to related parties...      489    2,500       --
  Principal payments on notes payable to related parties....     (659)  (2,622)  (9,733)
  Contributions from (distributions to) Parent..............       --     (116)     816
  Decrease in receivable from Parent........................      502    1,449    4,746
                                                               ------   ------   ------
          Net cash provided by (used in) financing
            activities......................................      332    1,211   (2,671)
                                                               ------   ------   ------
Effect of exchange rate changes on cash.....................      (61)      75      (17)
                                                               ------   ------   ------
Increase (decrease) in cash and cash equivalents............       14     (173)   1,708
Cash and cash equivalents, beginning of period..............      939      953      780
                                                               ------   ------   ------
Cash and cash equivalents, end of period....................   $  953   $  780   $2,488
                                                               ======   ======   ======
</TABLE>
 
                 The accompanying notes are an integral part of
                     the consolidated financial statements.
 
                                       F-6
<PAGE>   53
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
  The Company
 
     OYO Geospace Corporation ("OYO") is a wholly-owned subsidiary of OYO
Corporation U.S.A. (the "Parent"). The Parent is a wholly-owned subsidiary of
OYO Corporation, a Japanese corporation ("OYO Japan"). OYO was formed in 1994,
and effective September 30, 1994, the Parent transferred its investments in
various wholly-owned subsidiaries to OYO. Through its subsidiaries, OYO designs,
manufactures and distributes instruments and equipment used primarily in the
acquisition and processing of seismic data in the oil and gas industry.
 
     Effective September 30, 1997, in anticipation of a proposed initial public
offering of common stock, OYO distributed to the Parent its investment in
TrueTime, Inc. ("TrueTime"), a business segment that comprised the design,
manufacturing and distribution of precision time and frequency instruments.
TrueTime has separate management, operating facilities and administrative
functions, and none of its operating assets were retained. Accordingly, the
accompanying financial statements exclude the accounts of TrueTime for all
periods presented. The results of operations applicable to TrueTime that have
been excluded from the accompanying financial statements are as follows:
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED SEPTEMBER 30,
                                                           --------------------------
                                                            1995      1996      1997
                                                           ------    ------    ------
                                                                 (IN THOUSANDS)
<S>                                                        <C>       <C>       <C>
Net income...............................................  $1,179    $1,157    $1,255
Net income per share.....................................  $  .29    $  .29    $  .31
</TABLE>
 
     OYO and its subsidiaries, exclusive of TrueTime, are referred to
collectively as "OYO Geospace" or the "Company". The Company operates as a
single business segment. The significant accounting policies followed by the
Company are summarized below.
 
  Basis of Presentation
 
     The accompanying financial statements present the consolidated financial
position and results of operations of the Company's equipment manufacturing
operations. Intercompany balances and transactions, except those between the
Company and TrueTime, have been eliminated.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
  Cash and Cash Equivalents
 
     The Company considers all highly liquid debt securities purchased with an
original maturity of three months or less to be cash equivalents. The Company
maintains its cash in bank deposit accounts which, at times, may exceed
federally insured limits.
 
  Concentrations of Credit Risk
 
     The Company sells products to customers throughout the United States and
various foreign countries. The Company's normal credit terms for trade
receivables are 30 days. In certain situations, credit terms may be extended to
60 days. The Company performs ongoing credit evaluations of its customers and
generally does
 
                                       F-7
<PAGE>   54
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
not require collateral. Additionally, the Company provides long-term financing
in the form of promissory notes when competitive conditions require such
financing. Allowances are maintained for potential credit losses. One customer
accounted for a substantial portion of the Company's notes receivable (see Note
4) and 4.6% and 10.4% of sales during the years ended September 30, 1995 and
1996, respectively.
 
  Inventories
 
     Inventories are stated at the lower of cost (as determined by the first-in,
first-out method) or market. A single company is the sole supplier of a key
component of the Company's line of wide-body thermal plotters.
 
  Property, Plant and Equipment and Rental Equipment
 
     Property, plant and equipment and rental equipment are stated at cost.
Depreciation expense is provided by straight-line and accelerated methods over
the following estimated useful lives:
 
<TABLE>
<CAPTION>
                                                               YEARS
                                                              -------
<S>                                                           <C>
Rental equipment............................................    3-5
Property, plant and equipment:
  Machinery and equipment...................................   3-10
  Buildings.................................................     25
  Other.....................................................   5-10
</TABLE>
 
     Expenditures for renewals and betterments are capitalized. Repairs and
maintenance are charged to expense as incurred. The cost and accumulated
depreciation of assets sold or otherwise disposed of are removed from the
accounts and any gain or loss thereon is reflected in operations.
 
  Revenue Recognition
 
     Revenue is primarily derived from the sale and short-term rental under
operating lease of seismic instruments and equipment. Revenue is recognized when
the products are shipped or the rentals occur. Short-term rentals comprised less
than 10% of sales revenues for the years ended September 30, 1995, 1996 and
1997.
 
  Foreign Currency Gains and Losses
 
     The assets and liabilities of foreign subsidiaries have been translated to
U.S. dollars using the exchange rates in effect at the balance sheet date.
Results of operations have been translated using the average exchange rates
during the year. Resulting translation adjustments have been recorded as a
separate component of stockholder's equity as "Cumulative Foreign Currency
Translation Adjustments." Foreign currency transaction gains and losses are
included in the consolidated statement of operations as they occur.
 
  Income Taxes
 
     The Company joins in the consolidated U.S. income tax return of the Parent.
Federal income taxes are provided as if a separate income tax return was filed.
Foreign subsidiaries file separate income tax returns in the applicable foreign
jurisdictions.
 
     The Company follows the liability method of accounting for income taxes
whereby deferred tax assets and liabilities are determined based on the
differences between financial reporting and tax bases of assets and liabilities
and are measured using the enacted tax rates and laws that will be in effect
when the differences are expected to reverse. The Company provides a valuation
allowance, if necessary, to reduce deferred tax assets to their estimated
realizable value.
 
                                       F-8
<PAGE>   55
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
  Research and Development Costs
 
     Research and development costs are expensed as incurred.
 
  Goodwill
 
     Goodwill represents the excess of the purchase price of purchased
subsidiaries over the estimated fair value of the net assets at the date of
acquisition. Goodwill is amortized using the straight-line method over 40 years.
The Company reviews the carrying value of goodwill to determine whether there
has been an impairment since the date of acquisition by comparing the book value
of those assets to the anticipated future undiscounted cash flows of those
businesses or transactions which gave rise to the assets. If such undiscounted
cash flows are less than the book value of the asset, such asset is written down
to fair value.
 
  Product Warranties
 
     The Company sells products under warranties generally ranging from 1 year
to 3 years. The estimated future cost under existing warranties has been
provided for in the accompanying consolidated financial statements.
 
  Financial Instruments
 
     Financial instruments of the Company consist of cash and cash equivalents
and amounts receivable and payable. The fair value of financial instruments
approximates the amounts reported in the accompanying consolidated financial
statements.
 
  Recent Accounting Pronouncements
 
     In February 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 128, Earnings Per Share ("SFAS
128"). SFAS 128 changes the computation of earnings per share and requires dual
presentation of basic and diluted earnings per share. SFAS 128 is effective for
financial statements issued for periods ending after December 15, 1997,
including interim periods. SFAS 128 is not expected to have a material impact on
earnings per share.
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, "Reporting Comprehensive Income" ("SFAS 130"). SFAS 130 establishes
standards for reporting and display of comprehensive income and its components
(revenues, expenses, gains and losses) in a full set of general-purpose
financial statements. It requires (a) classification of the components of other
comprehensive income by their nature in a financial statement and (b) the
display of the accumulated balance of the other comprehensive income separate
from retained earnings and additional paid-in capital in the equity section of a
statement of financial position. SFAS 130 is effective for years beginning after
December 15, 1997 and is not expected to have a material impact on financial
position or results of operations.
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, "Disclosure about Segments of an Enterprise and Related Information"
("SFAS 131"). SFAS 131 establishes standards for reporting information about
operating segments in annual financial statements and requires selected
information about operating segments in interim financial reports issued to
shareholders. It also establishes standards for related disclosures about
products and services, geographic areas and major customers. The Company has not
determined the impact of SFAS 131 on its financial reporting practices.
 
2. RELATED PARTY ACQUISITION:
 
     In May 1996, the Company purchased all of the outstanding common stock of
OYO UK Limited and OYO Investment UK Limited from OYO Japan for $1.6 million in
cash. OYO UK Limited and OYO Investment UK Limited are incorporated in the
United Kingdom and are referred to collectively as "OYO UK". The operations of
OYO UK consist primarily of sales of the Company's products in foreign markets.
The net assets of OYO UK are included in the accompanying consolidated financial
statements subsequent to the acquisition date at historical cost in a manner
similar to a pooling of interests since OYO UK and the
 
                                       F-9
<PAGE>   56
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
Company are under common control. The purchase price paid exceeded the
historical cost of OYO UK's net assets by $0.1 million and such excess has been
recorded as a distribution to the Parent in the accompanying consolidated
financial statements. The results of operations of OYO UK are included in the
accompanying consolidated statement of operations beginning January 1, 1996. The
results of operations of OYO UK for the year ended September 30, 1995, and for
the period from October 1, 1995 through December 31, 1995, were immaterial.
 
3. INVENTORIES:
 
     Inventories consisted of the following:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Finished goods and subcomponents............................   $ 2,964       3,385
Work in process.............................................     2,143       2,641
Raw materials...............................................     7,757       9,009
                                                               -------     -------
                                                               $12,864     $15,035
                                                               =======     =======
</TABLE>
 
4. NOTES RECEIVABLE:
 
     Notes receivable from customers consisted of the following:
 
<TABLE>
<CAPTION>
                                                                  AS OF
                                                              SEPTEMBER 30,
                                                              --------------
                                                              1996     1997
                                                              -----    -----
                                                              (IN THOUSANDS)
<S>                                                           <C>      <C>
Notes receivable with a customer under term and line of
  credit agreements, net of deferred interest and allowance
  for doubtful accounts, with various terms as described
  below.....................................................   $ --     $ --
Various notes receivable from customers bearing interest
  ranging from 8% per year to 12% per year, payable in
  monthly installments with final installments at various
  dates through April 1999..................................    532      161
                                                               ----     ----
                                                                532      161
Current maturities included in current trade accounts
  receivable................................................   (532)     131
                                                               ----     ----
                                                               $ --     $ 30
                                                               ====     ====
</TABLE>
 
     Notes receivable with a customer under term and line of credit agreements
consist of two promissory notes with the following terms:
 
          Term Note -- In fiscal 1992, the Company provided $5.0 million under a
     line of credit sales agreement to finance sales to the customer, bearing
     interest at 12%. Interest and principal was payable monthly with principal
     payments based on 5% of the outstanding balance as of the end of the
     previous month. During the months of August 1993 through January 1994, the
     Company temporarily modified the terms by lowering the monthly principal
     payments to 2.5% of the outstanding balance as of the end of the previous
     month. In December 1995, the line of credit was terminated and the
     outstanding balance at termination of $3.4 million was converted into a
     term loan, bearing interest at 12% per year, and payable in 48 monthly
     installments of $0.1 million, including interest, commencing January 16,
     1996. The Company recorded a provision for loss of $1.5 million as of
     September 30, 1992 on the note receivable as a result of various defaults
     by the customer. In addition, interest income has not been recognized for
     periods subsequent to September 30, 1992. As of September 30, 1996, the
     customer was in default of the term note agreement for failure to make
     scheduled principal and interest payments.
 
                                      F-10
<PAGE>   57
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
          Line of Credit -- In January 1996, the Company provided $3.0 million
     under a line of credit sales agreement, bearing interest at LIBOR + 3% and
     maturing on September 30, 1996. At September 30, 1996, the customer was in
     default for failure to make scheduled interest payments and failure to
     repay the outstanding balance at maturity.
 
     On December 6, 1996, the customer filed for protection under Chapter 11 of
the bankruptcy code. The Company believed there was substantial doubt regarding
the ability to recover any amounts on the notes receivable with the customer.
Accordingly, a provision for loss of $2.8 million was recorded as of September
30, 1996, to reduce the combined carrying balance of the term and line of credit
notes receivable to zero. Following is an analysis of combined activity with
respect to the term and line of credit notes receivable:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                SEPTEMBER 30,
                                                              ------------------
                                                               1995       1996
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Contractual balance, beginning of period....................  $ 3,355    $ 3,229
Sales to the customer.......................................    1,229      2,862
Interest income added to principal..........................      420        567
Payments received...........................................   (1,775)      (463)
                                                              -------    -------
Contractual balance, end of period..........................    3,229      6,195
Allowance for loss..........................................   (1,500)    (4,334)
Interest income deferred....................................   (1,293)    (1,861)
                                                              -------    -------
Balance as reported, end of period..........................  $   436    $    --
                                                              =======    =======
</TABLE>
 
   
     During the year ended September 30, 1997, the Company made sales to the
customer under the line of credit and recognized bad debt expense of $0.1
million. The Company also made cash on delivery sales to the customer during the
year ended September 30, 1997 of 0.6 million and recognized gross profit on such
sales of $0.2 million. On April 29, 1997, the Company established secured
creditor status with the bankruptcy court with respect to the amounts due under
the notes receivable. In September 1997, the Company assigned its rights as a
secured creditor to an unrelated entity, without recourse, in exchange for cash
in the amount of 90% of the aggregate principal and accrued interest on the
notes receivable. On September 29, 1997, the Company collected $6.2 million,
including reimbursement of legal fees of $0.1 million, as a result of the
assignment. Under order of the bankruptcy court, the Company is required to
provide equipment purchase credits to the customer in the amount of $1.0 million
and, accordingly, a liability for this amount was recorded as of September 30,
1997. The Company recognized income from the recovery in the statement of
operations for the year ended September 30, 1997, in the aggregate amount of
$5.1 million, consisting of $4.4 million of recovery of bad debt expense
recognized in the current and prior years, and $0.7 million of interest income.
    
 
5. RENTAL EQUIPMENT:
 
     Rental equipment consisted of the following:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Geophones and related products..............................    $3,356      $4,198
Accumulated depreciation....................................    (2,077)     (1,804)
                                                                ------      ------
                                                                $1,279      $2,394
                                                                ======      ======
</TABLE>
 
                                      F-11
<PAGE>   58
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. PROPERTY, PLANT AND EQUIPMENT:
 
     Property, plant and equipment consisted of the following:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              -------------------
                                                                1996       1997
                                                              --------   --------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Land........................................................   $   422    $ 1,792
Buildings...................................................       504      3,286
Machinery and equipment.....................................     4,325      4,666
Furniture and fixtures......................................       416        771
Transportation equipment....................................       183        265
Tools and molds.............................................       603        620
Leasehold improvements......................................       320        298
                                                               -------    -------
                                                                 6,773     11,698
Accumulated depreciation and amortization...................    (4,027)    (5,590)
                                                               -------    -------
                                                               $ 2,746    $ 6,108
                                                               =======    =======
</TABLE>
 
7. NOTES PAYABLE TO BANKS AND RELATED PARTIES:
 
     In September 1997, the Company entered into uncommitted, uncollateralized
line of credit agreements with banks in the aggregate amount of $13.0 million.
Outstanding borrowings bear interest at a LIBOR-based rate. At September 30,
1997, the Company had outstanding borrowings of $1.5 million at an interest rate
of 6.9%, which matured on October 29, 1997, and which were extended to December
1, 1997, at an interest rate of 6.22%.
 
     Notes payable to related parties consisted of the following:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Outstanding borrowings under bank lines of credit of the
  Parent, bearing interest at a weighted average rate of
  6.42% and 6.04% at September 30, 1995 and 1996,
  respectively, principal and interest payable at various
  dates from February 1997 through June 1997................   $ 2,810     $    --
$6,950 line of credit from OYO Japan, bearing interest at
  3.25% per year, (effective January 1, 1997, the interest
  rate was increased to 6.19%), interest payable quarterly,
  principal due on demand, collateralized by substantially
  all of the assets of the Company..........................     6,950          --
$2,800 line of credit from OYO Japan, payable in 20
  semi-annual installments of $140, plus interest due
  quarterly at 3.25% per year, (effective January 1, 1997,
  the interest rate was increased to 6.19%), collateralized
  by substantially all of the assets of the Company.........       840          --
Note payable to the Parent, bearing interest at 6% per year,
  principal and interest payable in 20 annual installments,
  collateralized by substantially all of the assets of OYO
  UK........................................................       416          --
</TABLE>
 
                                      F-12
<PAGE>   59
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Note payable to an affiliate, noninterest bearing, payable
  in 120 monthly installments of CDN $787, maturing August
  2000, collateralized by leasehold improvements............        27          --
                                                               -------     -------
                                                                11,043          --
Current maturities..........................................    (3,124)         --
                                                               -------     -------
                                                               $ 7,919     $    --
                                                               =======     =======
</TABLE>
 
     In September 1997, the Company retired all related party debt at carrying
value for cash, with the exception of $1.3 million of debt which was contributed
by the Parent to the Company's additional paid-in capital (Note 11).
 
8. ACCRUED EXPENSES:
 
     Accrued expenses consisted of the following:
 
   
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Employee bonuses............................................    $  891      $1,426
Product warranty............................................       202         205
Compensated absences........................................       167         171
Legal and professional fees.................................       150         166
Customer equipment purchase credits.........................        --       1,027
Other.......................................................       521         721
                                                                ------      ------
                                                                $1,931      $3,716
                                                                ======      ======
</TABLE>
    
 
9. STOCKHOLDER'S EQUITY:
 
     In conjunction with a planned initial public offering, the Company has
filed a registration statement with the Securities and Exchange Commission to
offer 2,000,000 common shares, including 1,000,000 common shares owned by
Parent. The Company and the Parent has each agreed to grant the underwriters
options to purchase up to 150,000 additional common shares (aggregate of 300,000
shares) to cover over-allotments, if any.
 
     In anticipation of the planned initial public offering, the board of
directors of the Company approved an increase in the authorized shares of the
Company's common stock thereby increasing the authorized number of shares to
20,000,000. In addition, the board of directors approved a 4,000-for-1 common
stock split thereby increasing the number of shares owned by Parent to
4,000,000. Earnings per share information has been computed as if the Company's
common stock, giving effect to the stock split, had been outstanding for all
periods presented.
 
   
     In September 1997, the board of directors approved the 1997 Key Employee
Stock Option Plan and the 1997 Non-Employee Director Plan and reserved an
aggregate of 500,000 shares for issuance thereunder. No options have been
granted under either plan.
    
 
                                      F-13
<PAGE>   60
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
10. INCOME TAXES:
 
     Components of income before income taxes were as follows:
 
<TABLE>
<CAPTION>
                                                           YEAR ENDED SEPTEMBER 30,
                                                          ---------------------------
                                                           1995      1996      1997
                                                          ------    ------    -------
                                                                (IN THOUSANDS)
<S>                                                       <C>       <C>       <C>
United States...........................................  $3,341    $  756    $ 9,265
Foreign.................................................     579       830      1,360
                                                          ------    ------    -------
                                                          $3,920    $1,586    $10,625
                                                          ======    ======    =======
</TABLE>
 
     The provision for income taxes consisted of the following:
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED SEPTEMBER 30,
                                                           --------------------------
                                                            1995      1996      1997
                                                           ------    ------    ------
                                                                 (IN THOUSANDS)
<S>                                                        <C>       <C>       <C>
Current:
  Federal................................................  $1,097    $  707    $1,731
  Foreign................................................     289       321       634
  State..................................................     185       170       156
                                                           ------    ------    ------
                                                            1,571     1,198     2,521
                                                           ------    ------    ------
Deferred:
  Federal................................................     (13)     (376)    1,281
  Foreign................................................      21       (29)       --
  State..................................................      --      (216)      201
                                                           ------    ------    ------
                                                                8      (621)    1,482
                                                           ------    ------    ------
                                                           $1,579    $  577    $4,003
                                                           ======    ======    ======
</TABLE>
 
     The differences between the effective tax rate reflected in the total
provision for income taxes and the statutory federal tax rate of 34% were as
follows:
 
   
<TABLE>
<CAPTION>
                                                            YEAR ENDED SEPTEMBER 30,
                                                           --------------------------
                                                            1995      1996      1997
                                                           ------    ------    ------
<S>                                                        <C>       <C>       <C>
Provision for U.S. federal income tax at statutory
  rate...................................................  $1,333    $  539    $3,613
Effect of foreign income taxes...........................      55        64       171
State income taxes, net of federal income tax benefit....     123       (30)      236
Nondeductible amortization...............................      11        12        12
Other, net...............................................      57        (8)      (29)
                                                           ------    ------    ------
                                                           $1,579    $  577    $4,003
                                                           ======    ======    ======
</TABLE>
    
 
     Deferred income taxes under the liability method reflect the net tax
effects of temporary differences between the carrying amounts of assets and
liabilities for financial reporting purposes and the amounts used for income tax
purposes. Significant components of the Company's net deferred income tax asset
were as follows:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Deferred income tax assets:
  Allowance for doubtful accounts...........................    $  193      $  241
  Allowance for loss and deferred interest on notes
     receivable.............................................     1,474          --
  Inventory.................................................       649         745
  Accrued product warranty..................................        69          70
</TABLE>
 
                                      F-14
<PAGE>   61
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
  Accrued compensated absences..............................        51          59
  Other.....................................................       170          --
                                                                ------      ------
                                                                 2,606       1,115
Deferred income tax liabilities:
  Property, plant and equipment and other...................      (931)       (989)
                                                                ------      ------
Net deferred income tax asset...............................    $1,675      $  126
                                                                ======      ======
</TABLE>
 
     Deferred income taxes as of September 30, 1995 and 1996, are reported as
follows in the accompanying consolidated balance sheet:
 
<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30,
                                                              --------------------
                                                                1996        1997
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Current deferred income tax asset...........................    $  962      $1,115
Noncurrent deferred income tax asset........................       713          --
Noncurrent deferred tax liability...........................        --        (854)
                                                                ------      ------
                                                                $1,675      $  261
                                                                ======      ======
</TABLE>
 
     Under the liability method, a valuation allowance is provided when it is
more likely than not that some portion or all of the deferred tax assets will
not be realized. Based on the Company's historical taxable income record, and
the expectation that the deductible temporary differences will reverse during
periods in which the Company generates net taxable income or during periods in
which losses can be carried back to offset prior year taxes, management believes
that the Company will realize the benefit of net deferred tax assets.
 
     The financial reporting bases of investments in foreign subsidiaries
exceeds their tax basis. A deferred tax liability is not recorded for this
temporary difference because the investment is essentially permanent. A reversal
of the Company's plans to permanently invest in the operations would cause the
excess to become taxable. At September 30, 1996 and 1997, the temporary
difference related to undistributed earnings for which no deferred taxes have
been provided was approximately $2.0 million and $0.6 million, respectively. The
determination of the unrecognized deferred tax liability related to the
undistributed earnings is not practical.
 
11. RELATED PARTY TRANSACTIONS:
 
     Sales to OYO Japan and other affiliated companies, including OYO UK prior
to the May 1996 acquisition, were approximately $2.0 million, $0.9 million and
$0.6 million during the years ended September 30, 1995, 1996 and 1997,
respectively. Purchases of inventory and equipment for resale from OYO Japan
were approximately $2.8 million, $2.9 million and $2.4 million during the years
ended September 30, 1995, 1996 and 1997, respectively.
 
     Interest expense on the lines of credit from OYO Japan was approximately
$0.3 million, $0.3 million and $0.4 million during the years ended September 30,
1995, 1996 and 1997, respectively. The average outstanding principal balance on
the lines of credit from OYO Japan was approximately $8.3 million, $7.9 million
and $7.4 million during the years ended September 30, 1995, 1996 and 1997,
respectively.
 
     Effective September 30, 1997, the Company purchased land, buildings and
equipment used in the Company's operations from affiliates for $2.5 million in
cash. The Company previously leased the facilities from the affiliates and
incurred rent expense of approximately $0.2 million during each of the years
ended September 30, 1994, 1995 and 1996. The purchase of land, buildings and
equipment was recorded at the historical net book of the affiliates since the
Company and affiliates are under common control. The excess of the historical
net book value over the purchase of $0.2 million was recorded to additional
paid-in capital, net of deferred income taxes of $0.1 million.
 
                                      F-15
<PAGE>   62
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Prior to September 19, 1997, the Company participated in the cash
management system of the Parent whereby the net cash generated from daily
operations was swept to the Parent's concentration account and cash required for
daily operations was provided from the Parent's concentration account. There
were no terms for interest or repayment on the resulting intercompany balances.
At September 30, 1995 and 1996, the Company had a net receivable from the Parent
resulting from the cash management system of $6.2 million and $4.7 million,
respectively, which is presented as a component of stockholder's equity in the
accompanying consolidated balance sheet. On September 19, 1997, the Company
separated from the Parent's cash management system and the receivable on that
date of $5.0 million was collected in cash. At the separation date, the Parent
made a cash contribution to the Company of $0.8 million as consideration for
interest on the receivable balance during the period October 1994 through the
separation date.
 
     During September 1997, additional paid-in capital was increased from the
following transactions with the Parent:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Excess of historical net book value of land, buildings and
  equipment over the purchase price, net of deferred income
  taxes.....................................................      $  116
Contribution of obligations owed to the Parent..............       4,165
Interest on receivable from the Parent......................         775
Other.......................................................          42
                                                                  ------
                                                                  $5,098
                                                                  ======
</TABLE>
 
12. COMMITMENTS AND CONTINGENCIES:
 
  Operating Leases
 
     The Company leases certain office space and equipment under noncancelable
operating leases. The approximate future minimum rental commitments under
noncancelable operating leases are as follows:
 
<TABLE>
<CAPTION>
                        YEAR ENDING
                       SEPTEMBER 30,
                       -------------                          (IN THOUSANDS)
<S>                                                           <C>
   1998.....................................................       $187
   1999.....................................................        179
   2000.....................................................         16
   2001 and thereafter......................................         17
                                                                   ----
                                                                   $399
                                                                   ====
</TABLE>
 
     Rent expense was approximately $0.4 million for each of the years ended
September 30, 1995, 1996 and 1997, respectively, including rent expense on land,
buildings, and equipment which the Company purchased September 30, 1997, as
described in Note 11.
 
  Retirement Plan
 
     The Company's employees are participants in the Parent's 401(k) Retirement
Plan (the "Plan"), which covers substantially all eligible employees in the
United States. The Plan is a qualified salary reduction plan in which all
eligible participants may elect to have a percentage of their compensation
contributed to the Plan, subject to certain guidelines issued by the Internal
Revenue Service. The Company's share of discretionary contributions was
approximately $0.2 million for each of the years ended September 30, 1995, 1996
and 1997, respectively.
 
  Legal Proceedings
 
     From time to time the Company is a party to what it believes is routine
litigation and proceedings that may be considered as part of the ordinary course
of its business.
 
                                      F-16
<PAGE>   63
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The Company has received a copy of a letter from a law firm representing a
competitor which was sent to certain employees of the Company, including two
officers, who were formerly employees of the competitor, making certain
accusations and threats on account of their employment by the Company. It
appears to be the allegation that such employees, by accepting employment with
the Company, have breached obligations as to confidential information, trade
secrets and, (with respect to certain of such employees, excluding the two
officers) non-competition with the competitor and that the Company has some role
in such activities. While it is unable to predict whether any action will be
taken against it or against any such employees, the Company does not believe
that it has done anything improper in hiring certain former employees of the
competitor and will vigorously defend against any claim made against it in such
regards. The Company further understands that such employees, and in particular
those which are officers of the Company, will likewise vigorously defend against
any such claim. Nonetheless, should the competitor pursue legal action against
the Company with respect to these matters and prevail, such proceeding could
have an adverse effect on the Company's business, results of operations, cash
flows or financial condition.
 
     The Company is not aware of any other current or pending litigation or
proceedings that could have a material adverse effect on the Company's results
of operations, cash flows or financial condition.
 
13. SUPPLEMENTAL CASH FLOW INFORMATION:
 
     Supplemental cash flow information was as follows:
 
   
<TABLE>
<CAPTION>
                                                          YEAR ENDED SEPTEMBER 30,
                                                        -----------------------------
                                                         1995       1996       1997
                                                        -------    -------    -------
                                                               (IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Cash paid for:
  Interest............................................  $   359    $   409    $   207
  Income taxes........................................    2,616      2,095      2,241
Noncash investing and financing activities:
  Contribution of obligations owed to Parent..........       --         --      4,165
</TABLE>
    
 
     Assets acquired, other than cash, and liabilities assumed with the May 1996
acquisition of OYO UK totaled $1.6 million and $0.7 million, respectively.
 
14. FOREIGN OPERATIONS:
 
     Summary financial information of the Company's foreign subsidiaries is
presented below:
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED SEPTEMBER 30,
                                                        -----------------------------
                                                         1995       1996       1997
                                                        -------    -------    -------
                                                               (IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Net sales:
  United States.......................................  $31,200    $29,797    $39,736
  Canada..............................................    4,169      3,066      4,590
  Europe..............................................       --      2,167      2,541
  Eliminations........................................   (2,754)    (4,152)    (5,818)
                                                        -------    -------    -------
                                                        $32,615    $30,878    $41,049
                                                        =======    =======    =======
Income from operations:
  United States.......................................  $ 4,236    $ 1,399    $ 9,676
  Canada..............................................      570        664      1,172
  Europe..............................................       --         20         77
  Eliminations........................................       45        (31)      (363)
                                                        -------    -------    -------
                                                        $ 4,851    $ 2,052    $10,562
                                                        =======    =======    =======
</TABLE>
 
                                      F-17
<PAGE>   64
 
                   OYO GEOSPACE CORPORATION AND SUBSIDIARIES
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                             AS OF SEPTEMBER 30,
                                                        -----------------------------
                                                         1995       1996       1997
                                                        -------    -------    -------
                                                               (IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Identifiable assets:
  United States.......................................  $23,160    $24,497    $30,186
  Canada..............................................    3,821      3,709      6,799
  Europe..............................................       --      3,237      2,186
  Eliminations........................................   (2,722)    (5,171)    (4,093)
                                                        -------    -------    -------
                                                        $24,259    $26,272    $35,078
                                                        =======    =======    =======
</TABLE>
 
                                      F-18
<PAGE>   65
 
============================================================
 
     NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THE OFFERING
DESCRIBED IN THIS PROSPECTUS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY OF THE UNDERWRITERS. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER
TO BUY, THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO WHOM
IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION. NEITHER
THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION HEREIN IS CORRECT AS
OF ANY TIME SUBSEQUENT TO THE DATE HEREOF OR THAT THERE HAS BEEN NO CHANGE IN
THE AFFAIRS OF THE COMPANY SINCE SUCH DATE.
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                             PAGE
                                             ----
<S>                                          <C>
Prospectus Summary.........................     3
Risk Factors...............................     8
The Company................................    13
Use of Proceeds............................    14
Dividend Policy............................    14
Dilution...................................    15
Capitalization.............................    15
Selected Financial Data....................    16
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...............................    17
Business...................................    21
Management.................................    30
Relationship With OYO Japan and Related
  Transactions.............................    35
Security Ownership of Management and
  Principal Stockholder....................    36
Selling Stockholder........................    37
Description of Capital Stock...............    37
Shares Eligible for Future Sale............    39
Underwriting...............................    41
Legal Matters..............................    42
Experts....................................    42
Available Information......................    42
Glossary...................................    44
Index to Financial Statements..............   F-1
</TABLE>
 
  UNTIL             , 1997 (25 DAYS AFTER THE COMMENCEMENT OF THE OFFERING), ALL
DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK OFFERED HEREBY, WHETHER OR
NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS DELIVERY REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER
A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.
 
============================================================
 
============================================================
 
                                2,000,000 SHARES
 
                              [OYO GEOSPACE LOGO]
 
                                  COMMON STOCK

                            -----------------------
 
                                   PROSPECTUS

                            -----------------------

                         RAUSCHER PIERCE REFSNES, INC.
 
                        RAYMOND JAMES & ASSOCIATES, INC.

                                               , 1997
 
============================================================
<PAGE>   66
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The estimated expenses in connection with the Offering are:
 
   
<TABLE>
<S>                                                           <C>
Securities and Exchange Commission Registration Fee.........  $  9,758
NASD Filing Fee.............................................     3,490
Nasdaq National Market Listing Fee..........................    30,225
Legal Fees and Expenses.....................................   150,000*
Accounting Fees and Expenses................................   100,000*
Blue Sky Fees and Expenses (including legal fees)...........    10,000*
Printing Expenses...........................................    90,000*
Transfer Agent and Registrar Fees...........................    25,000*
Miscellaneous...............................................    81,527*
                                                              --------
          TOTAL.............................................  $500,000
                                                              ========
</TABLE>
    
 
- ---------------
 
 * estimated
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Company's Restated Certificate of Incorporation contains a provision
that eliminates the personal liability of a director to the Company and its
stockholders for monetary damages for breach of his fiduciary duty as a director
to the extent currently allowed under the Delaware General Corporation Law. If a
director were to breach such duty in performing his duties as a director,
neither the Company nor its stockholder could recover monetary damages from the
director, and the only course of action available to the Company's stockholders
would be equitable remedies, such as an action to enjoin or rescind a
transaction involving a breach of fiduciary duty. To the extent certain claims
against directors are limited to equitable remedies, the provision in the
Company's Restated Certificate of Incorporation may reduce the likelihood of
derivative litigation and may discourage stockholders or management from
initiating litigation against directors for breach of their fiduciary duty.
Additionally, equitable remedies may not be effective in many situations. If a
stockholder's only remedy is to enjoin the completion of the Board of Directors'
action, the remedy would be ineffective if the stockholder does not become aware
of a transaction or event until after it has been completed. In such a
situation, it is possible that the stockholders and the Company would have no
effective remedy against the directors. Under the Company's Restated Certificate
of Incorporation, liability for monetary damages remains for (i) any breach of
the duty of loyalty to the Company or its stockholders, (ii) acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation
of law, (iii) payment of an improper dividend or improper repurchase of the
Company's stock under Section 174 of the Delaware General Corporation Law or
(iv) any transaction from which the director derived an improper personal
benefit. The Company's Restated Certificate of Incorporation further provides
that in the event the Delaware General Corporation Law is amended to allow the
further elimination or limitation of the liability of directors, then the
liability of the Company's directors shall be limited or eliminated to the
fullest extent permitted by the amended Delaware General Corporation Law.
 
     Under the Company's Bylaws, each person who is or was a director or officer
of the Company or a subsidiary of the Company, or who serves or served any other
enterprise or organization at the request of the Company or a subsidiary of the
Company, shall be indemnified by the Company to the full extent permitted by the
Delaware General Corporation Law.
 
     Under Delaware law, to the extent that a person is successful on the merits
in defense of a suit or proceeding brought against him by reason of the fact
that he is or was a director or officer of the Company, or serves or served any
other enterprise or organization at the request of the Company, he shall be
indemnified against expenses (including attorneys' fees) actually and reasonably
incurred in connection with such action.
 
     Under Delaware law, to the extent an indemnified person is not successful
in defense of a third party civil suit or a criminal suit, or if such suit is
settled, such person shall be indemnified against both (i) expenses, including
attorneys' fees, and (ii) judgments, fines and amounts paid in settlement if he
acted in good faith
 
                                      II-1
<PAGE>   67
 
and in a manner he reasonably believed to be in, or not opposed to, the best
interests of the Company and, with respect to any criminal action, had no
reasonable cause to believe his conduct was unlawful, except that if such person
is adjudged to be liable in such a suit for negligence or misconduct in the
performance of his duty to the Company, he cannot be made whole even for
expenses unless the court determines that he is fully and reasonably entitled to
indemnity for such expenses.
 
     The Company intends to obtain insurance to protect officers and directors
from certain liabilities, including liabilities against which the corporation
cannot indemnify its directors and officers.
 
     The Company will enter into indemnification agreements with each of the
directors of the Company. Pursuant to such agreements, the Company will agree to
indemnify and hold each such director harmless to the fullest extent permitted
by law, from any loss, damage or liability incurred in the course of his
respective service as a director of the Company. The amount paid by the Company
is reducible by the amount of insurance paid to or on behalf of such director
with respect to any event giving rise to indemnification. Each such director's
right to indemnification is to survive his respective death or termination as
director.
 
     The Company's Bylaws provide for the indemnification of its officers and
directors and the advancement to them of expenses in connection with proceedings
and claims, to the fullest extent permitted under the Delaware General
Corporation Law. Such indemnification may be made even though directors and
officers would not otherwise be entitled to indemnification under other
provisions by the Bylaws.
 
     The above discussion of the Delaware General Corporation Law and of the
Company's Restated Certificate of Incorporation and Bylaws is not intended to be
exhaustive and is qualified in its entirety by such statute and the Restated
Certificate of Incorporation and Bylaws.
 
     Reference is made to the form of Underwriting Agreement filed as Exhibit
1.1 to the Registration Statement for certain provisions regarding the
indemnification of the Company, its officers and directors and any controlling
persons by the Underwriters against certain liabilities for information
furnished by the Underwriters.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers or persons controlling the Registrants
pursuant to the foregoing provisions, the Registrants have been informed that in
the opinion of the Commission such indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.
 
     Not applicable.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) Exhibits:
 
   
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
        **1.1            -- Form of Underwriting Agreement.
         *3.1            -- Restated Certificate of Incorporation of the Company.
         *3.2            -- Restated Bylaws of the Company.
         *4.1            -- Form of Common Stock Certificate.
         *4.2            -- See Exhibits numbered 3.1 and 3.2 for provisions of the
                            Certificate of Incorporation and Bylaws of the Company
                            defining the rights of the holders of Common Stock.
        **5.1            -- Opinion of Fulbright & Jaworski L.L.P.
        *10.1            -- Employment Agreement between the Company and Gary D.
                            Owens.
        *10.2            -- Employment Agreement between the Company and Michael J.
                            Sheen.
        *10.3            -- OYO Geospace Corporation 1997 Key Employee Stock Option
                            Plan.
</TABLE>
    
 
                                      II-2
<PAGE>   68
   
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
        *10.4            -- OYO Geospace Corporation 1997 Non-Employee Director Plan.
        *10.5            -- Printhead Purchase Agreement dated November 10, 1995
                            between the Company and OYO Corporation.
        *10.6            -- Master Sales Agreement dated November 10, 1995 between
                            the Company and OYO Corporation.
       **10.7            -- Form of Director Indemnification Agreement.
        *21.1            -- List of subsidiaries of OYO Geospace Corporation.
       **23.1            -- Consent of Coopers & Lybrand L.L.P.
       **23.2            -- Consent of Fulbright & Jaworski L.L.P. (included in
                            Exhibit 5.1).
        *23.3            -- Consent of named director (Thomas L. Davis).
        *23.4            -- Consent of named director (Charles H. Still).
        *23.5            -- Consent of named director (Michael J. Sheen).
        *24.1            -- Powers of Attorney from certain members of the Board of
                            Directors of the Company (contained on page II-5 of the
                            original Registration Statement filed September 30,
                            1997).
        *27.1            -- Financial Data Schedule.
</TABLE>
    
 
- ---------------
 
 * Previously filed.
 
** Filed herewith.
 
   
(b) Financial Statement Schedules:
    
 
     The following financial statement schedule is filed herewith.
 
        Schedule II -- Valuation and Qualifying Accounts
 
          All other schedules are omitted as the required information is
     inapplicable or the information is presented in the Financial Statements or
     the related Notes.
 
ITEM 17. UNDERTAKINGS.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
     The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
                                      II-3
<PAGE>   69
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be a part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-4
<PAGE>   70
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act, the Registrant has duly
caused this Amendment No. 1 to Registration Statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of Dallas, State of
Texas, on November 17, 1997.
    
 
                                            OYO Geospace Corporation
 
                                            By:      /s/ GARY D. OWENS
 
                                              ----------------------------------
                                                        Gary D. Owens
                                               Chairman of the Board, President
                                                              and
                                                   Chief Executive Officer
 
     Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed below by the following persons in the capacities and
on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                   TITLE                     DATE
                      ---------                                   -----                     ----
<C>                                                    <C>                           <C>
 
                  /s/ GARY D. OWENS                      Chairman of the Board,       November 17, 1997
- -----------------------------------------------------      President and Chief
                    Gary D. Owens                           Executive Officer
                                                          (Principal Executive
                                                                Officer)
 
               /s/ THOMAS T. MCENTIRE                    Chief Financial Officer      November 17, 1997
- -----------------------------------------------------   (Principal Financial and
                 Thomas T. McEntire                        Accounting Officer)
 
                          *                                     Director              November 17, 1997
- -----------------------------------------------------
                     Satoru Ohya
 
                          *                                     Director              November 17, 1997
- -----------------------------------------------------
                 Katsuhiko Kobayashi
 
                          *                                     Director              November 17, 1997
- -----------------------------------------------------
                 Ernest M. Hall, Jr.
 
               *By: /s/ GARY D. OWENS
  ------------------------------------------------
                    Gary D. Owens
                  Attorney-in-fact
</TABLE>
    
 
                                      II-5
<PAGE>   71
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
Board of Directors
OYO Geospace Corporation:
 
     Our report on the consolidated financial statements of OYO Geospace
Corporation and Subsidiaries as of September 30, 1997 and 1996, and for each of
the three years in the period ended September 30, 1997, is included on page F-2
of this Registration Statement. In connection with our audits of such financial
statements, we have also audited the related financial statement schedule
(Schedule II -- Valuation and Qualifying Accounts) for each of the three years
in the period ending September 30, 1997.
 
     In our opinion, the financial statement schedule referred to above, when
considered in relation to the basic financial statements taken as a whole,
presents fairly, in all material respects, the information required to be
included therein.
 
                                          COOPERS & LYBRAND L.L.P.
 
Houston, Texas
November 3, 1997
 
                                       S-1
<PAGE>   72
 
                                                                     SCHEDULE II
 
                            OYO GEOSPACE CORPORATION
 
                       VALUATION AND QUALIFYING ACCOUNTS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                            ADDITIONS
                                                     ------------------------
                                                      CHARGED
                                         BALANCE     (CREDITED)                                BALANCE
                                           AT         TO COSTS      CHARGED                    AT END
                                        BEGINNING       AND         TO OTHER                     OF
             DESCRIPTION                OF PERIOD     EXPENSES      ACCOUNTS     DEDUCTIONS    PERIOD
             -----------                ---------    ----------    ----------    ----------    -------
<S>                                     <C>          <C>           <C>           <C>           <C>
YEAR ENDED SEPTEMBER 30, 1995
  Allowance for doubtful accounts on
     accounts and notes receivable....   $1,601        $1,013        $  --        $   (28)     $2,586
  Deferred interest on notes
     receivable.......................      872            --          421(a)          --       1,293
YEAR ENDED SEPTEMBER 30, 1996
  Allowance for doubtful accounts on
     accounts and notes receivable....    2,586         2,860           --            (48)      5,398
  Deferred interest on notes
     receivable.......................    1,293            --          568(a)          --       1,861
YEAR ENDED SEPTEMBER 30, 1997
  Allowance for doubtful accounts and
     notes receivable.................    5,398        (4,228)          --           (399)        771
  Deferred interest on notes
     receivable.......................    1,861            --           --         (1,861)         --
</TABLE>
 
- ---------------
 
(a) Deferred interest on notes receivable charged against interest income.
 
                                       S-2
<PAGE>   73
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                                  DESCRIPTION
        -------                                  -----------
<C>                      <S>
        **1.1            -- Form of Underwriting Agreement.
         *3.1            -- Restated Certificate of Incorporation of the Company.
         *3.2            -- Restated Bylaws of the Company.
         *4.1            -- Form of Common Stock Certificate.
         *4.2            -- See Exhibits numbered 3.1 and 3.2 for provisions of the
                            Certificate of Incorporation and Bylaws of the Company
                            defining the rights of the holders of Common Stock.
        **5.1            -- Opinion of Fulbright & Jaworski L.L.P.
        *10.1            -- Employment Agreement between the Company and Gary D.
                            Owens.
        *10.2            -- Employment Agreement between the Company and Michael J.
                            Sheen.
        *10.3            -- OYO Geospace Corporation 1997 Key Employee Stock Option
                            Plan.
        *10.4            -- OYO Geospace Corporation 1997 Non-Employee Director Plan.
        *10.5            -- Printhead Purchase Agreement dated November 10, 1995
                            between the Company and OYO Corporation.
        *10.6            -- Master Sales Agreement dated November 10, 1995 between
                            the Company and OYO Corporation.
       **10.7            -- Form of Director Indemnification Agreement.
        *21.1            -- List of subsidiaries of OYO Geospace Corporation.
       **23.1            -- Consent of Coopers & Lybrand L.L.P.
       **23.2            -- Consent of Fulbright & Jaworski L.L.P. (included in
                            Exhibit 5.1).
        *23.3            -- Consent of named director (Thomas L. Davis).
        *23.4            -- Consent of named director (Charles H. Still).
        *23.5            -- Consent of named director (Michael J. Sheen).
        *24.1            -- Powers of Attorney from certain members of the Board of
                            Directors of the Company (contained on page II-5 of the
                            original Registration Statement filed September 30,
                            1997).
        *27.1            -- Financial Data Schedule.
</TABLE>
    
 
- ---------------
 
 * Previously filed.
 
   
** Filed herewith.
    

<PAGE>   1

                                                                   EXHIBIT 1.1

                            OYO GEOSPACE CORPORATION

                                2,000,000 SHARES
                                  COMMON STOCK
                           (PAR VALUE $0.01 PER SHARE)

                      ------------------------------------


                             UNDERWRITING AGREEMENT

                                                             November __, 1997.


RAUSCHER PIERCE REFSNES, INC.
RAYMOND JAMES & ASSOCIATES, INC.
     As representatives of the several Underwriters
     named in Schedule I hereto,
c/o Rauscher Pierce Refsnes, Inc.
2711 N. Haskell Ave., Suite 2400
Dallas, Texas  75204-2936

Ladies and Gentlemen:

         OYO Geospace Corporation, a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
to the Underwriters named in Schedule I hereto (the "Underwriters") an aggregate
of 1,000,000 shares of the Company's common stock, par value $0.01 per share
(the "Common Stock") and, at the election of the Underwriters, up to 150,000
additional shares of Common Stock, and OYO Corporation U.S.A., a Texas
corporation (the "Selling Stockholder"), proposes, subject to the terms and
conditions stated herein, to sell to the Underwriters an aggregate of 1,000,000
shares of Common Stock and, at the election of the Underwriters, up to 150,000
additional shares of Common Stock. The aggregate of 2,000,000 shares of Common
Stock to be sold by the Company and the Selling Stockholder is herein called the
"Firm Shares" and the aggregate of 300,000 additional shares of Common Stock to
be sold by the Company and the Selling Stockholder is herein called the
"Optional Shares". The Firm Shares and the Optional Shares that the Underwriters
elect to purchase pursuant to Section 2 hereof are herein collectively called
the "Shares".

         The Underwriters will reserve up to 300,000 shares of the Common Stock
(the "Directed Shares") from among the Firm Shares for offering and sale to
certain of the Company's officers, directors and employees and certain business
associates of the Company and the Selling Stockholder pursuant to a reserve
share program (the "Reserve Share Program"). The Directed Shares will be sold by
the Underwriters pursuant to this Agreement at the public offering price. Any
Directed Shares not purchased by such persons will be offered to the public by
the Underwriters as set forth in the Prospectus (as defined below).

1.       (a)  The Company represents and warrants to, and agrees with, each of 
the Underwriters that:



<PAGE>   2



                           (i) A registration statement on Form S-1 (File No.
                  333-36727) as amended by Amendment No. 1 thereto, in respect
                  of the Shares has been filed with the United States Securities
                  and Exchange Commission (the "Commission"); such registration
                  statement and any post-effective amendment thereto, each in
                  the form heretofore delivered to you, and, excluding exhibits
                  thereto, to you for each of the other Underwriters, have been
                  declared effective by the Commission in such form; no other
                  document with respect to such registration statement has
                  heretofore been filed with the Commission; and no stop order
                  suspending the effectiveness of such registration statement
                  has been issued and no proceeding for that purpose has been
                  initiated or threatened by the Commission (any preliminary
                  prospectus included in such registration statement or filed
                  with the Commission pursuant to Rule 424(a) of the rules and
                  regulations of the Commission under the Securities Act of
                  1933, as amended (the "Securities Act"), is hereinafter called
                  a "Preliminary Prospectus"); the various parts of such
                  registration statement, including all exhibits thereto and
                  including the information contained in the form of final
                  prospectus filed with the Commission pursuant to Rule 424(b)
                  under the Securities Act in accordance with Section 5(a)
                  hereof and deemed by virtue of Rule 430A under the Securities
                  Act to be part of the registration statement at the time it
                  was declared effective, each as amended at the time such part
                  of the registration statement became effective, are
                  hereinafter collectively called the "Registration Statement";
                  and such final prospectus, in the form first filed pursuant to
                  Rule 424(b) under the Securities Act, is hereinafter called
                  the "Prospectus"; if the Company has filed an abbreviated
                  registration statement pursuant to Rule 462(b) under the
                  Securities Act (the "Rule 462 Registration Statement"), then
                  reference herein to the term "Registration Statement" shall be
                  deemed to include such Rule 462 Registration Statement;

                           (ii) No order preventing or suspending the use of any
                  Preliminary Prospectus has been issued by the Commission, and
                  each Preliminary Prospectus, at the time of filing thereof,
                  conformed in all material respects to the requirements of the
                  Securities Act and the rules and regulations of the Commission
                  thereunder, and did not contain an untrue statement of a
                  material fact or omit to state a material fact required to be
                  stated therein or necessary to make the statements therein, in
                  the light of the circumstances under which they were made, not
                  misleading; provided, however, that this representation and
                  warranty shall not apply to any statements or omissions made
                  in reliance upon and in conformity with information furnished
                  in writing to the Company by an Underwriter through Rauscher
                  Pierce Refsnes, Inc. expressly for use therein;

                           (iii) The Registration Statement conforms, and the
                  Prospectus and any further amendments or supplements to the
                  Registration Statement or the Prospectus will conform, in all
                  material respects to the requirements of the Securities Act
                  and the rules and regulations of the Commission thereunder and
                  do not and will not, as of the applicable effective date as to
                  the Registration Statement and any amendment thereto and as of
                  the applicable filing date as to the Prospectus and any
                  amendment or supplement thereto, contain an untrue statement
                  of a material fact or omit to state a material fact required
                  to be stated therein or necessary to make the statements
                  therein not misleading; provided, however, that this
                  representation and warranty shall not apply to any statements
                  or omissions made in reliance upon and in conformity with
                  information furnished in writing to the company by an
                  Underwriter through Rauscher Pierce Refsnes, Inc. expressly
                  for use therein;


 
                                        2

<PAGE>   3



                           (iv) Each of the Printhead Purchase Agreement and the
                  Master Sales Agreement, in each case as defined in the
                  Registration Statement (such agreements referred to herein
                  collectively as the "Intercompany Agreements"), has been duly
                  authorized, executed and delivered by the Company and
                  constitutes the valid and legally binding agreement of the
                  Company enforceable against the Company in accordance with its
                  terms, except that enforceability may be limited by
                  bankruptcy, insolvency, reorganization, moratorium or other
                  similar laws now or hereafter in effect relating to creditors'
                  rights generally and may be subject to general principles of
                  equity, regardless of whether such enforceability is
                  considered in a proceeding in equity or at law;

                           (v) The only significant subsidiaries (as defined in
                  the rules and regulations of the Commission under the
                  Securities Act, referred to hereinafter as the "Securities Act
                  Regulations") of the Company are the subsidiaries listed on
                  Exhibit 21.1 to the Registration Statement (collectively, the
                  "Subsidiaries"). Each of the Subsidiaries is a corporation
                  duly organized and validly existing in good standing in the
                  jurisdiction of its incorporation with full corporate power
                  and authority to own, lease and operate its properties and to
                  conduct its business as described in the Registration
                  Statement and the Prospectus, and is duly registered and
                  qualified to conduct its business and is in good standing in
                  each jurisdiction or place where the nature or location of its
                  properties (owned or leased) or the conduct of its business
                  requires such registration or qualification, except where the
                  failure so to register or qualify could not have a Material
                  Adverse Effect (as defined below);

                           (vi) Neither the Company nor any of the Subsidiaries
                  has sustained since the date of the latest audited financial
                  statements included in the Prospectus any loss or interference
                  with its business from fire, explosion, flood or other
                  calamity, whether or not covered by insurance, or from any
                  organized labor dispute or court or governmental action, order
                  or decree, otherwise than as set forth or contemplated in the
                  Prospectus, which has had or is likely to have a Material
                  Adverse Effect; and, since the respective dates as of which
                  information is given in the Registration Statement and the
                  Prospectus, there has not been any change in the capital stock
                  or any increase in long-term debt of the Company and the
                  Subsidiaries or any material adverse change, or any
                  development involving a prospective material adverse change,
                  in or affecting the general affairs, management, prospects,
                  current or future consolidated financial position,
                  stockholders' equity or results of operations of the Company
                  and the Subsidiaries, taken as a whole, otherwise than as set
                  forth or contemplated in the Prospectus;

                           (vii) Except as described in the Prospectus, the
                  Company has good and indefeasible title to all material real
                  property and good and marketable title to all other material
                  properties and assets described in the Prospectus as owned by
                  the Company and valid, subsisting and enforceable leases for
                  all of the properties and assets, real or personal, described
                  in the Prospectus as leased by them, in each case free and
                  clear of any security interest, mortgages, pledges, liens,
                  encumbrances or charges of any kind, other than those
                  described in the Prospectus and those that could not,
                  individually or in the aggregate, have a material adverse
                  effect on the condition, financial or otherwise, or on the
                  earnings, business affairs or business prospects of the
                  Company (such an adverse effect to be hereinafter referred to
                  as a "Material Adverse Effect");


 
                                        3

<PAGE>   4



                           (viii) The Company has been duly incorporated and is
                  validly existing as a corporation in good standing under the
                  laws of the State of Delaware, with power and authority
                  (corporate and other) to own its properties and conduct its
                  business as described in the Prospectus, and has been duly
                  qualified as a foreign corporation for the transaction of
                  business and is in good standing under the laws of each other
                  jurisdiction in which it owns or leases properties or conducts
                  any business so as to require such qualification, or is
                  subject to no material liability or disability by reason of
                  the failure to be so qualified in any such jurisdiction;

                           (ix) The Company has the authorized capitalization
                  set forth in the Prospectus under the heading "Description of
                  Capital Stock", and all of the issued shares of Common Stock
                  of the Company have been duly and validly authorized and
                  issued, are fully paid and non-assessable and conform to the
                  description of the Common Stock contained in the Prospectus
                  under the heading "Description of Capital Stock"; and all of
                  the issued shares of capital stock of each of the Subsidiaries
                  have been duly and validly authorized and issued, are fully
                  paid and non-assessable and (except as set forth in the
                  Prospectus) are owned directly or indirectly by the Company,
                  free and clear of all liens, encumbrances, equities or claims;
                  the holders of outstanding shares of capital stock of the
                  Company are not entitled to preemptive or other rights to
                  acquire the Shares which have not been complied with; except
                  as set forth in the Prospectus, there are no outstanding
                  securities convertible into or exchangeable for, or warrants,
                  rights or options to purchase from the Company, or obligations
                  of the Company to issue, shares of Common Stock or any other
                  class of capital stock of the Company; and, except as set
                  forth in the Prospectus, there are no restrictions on
                  subsequent transfers of the Shares under the laws of the
                  United States (other than sales of Shares owned by the Company
                  and its affiliates);

                           (x) The Shares have been duly and validly authorized
                  and, when issued and delivered against payment therefor as
                  provided herein, will be duly and validly issued and fully
                  paid and non-assessable and will conform to the description of
                  the Shares contained in the Prospectus under the heading
                  "Description of Capital Stock";

                           (xi) This Agreement has been duly authorized,
                  executed, and delivered by the Company;

                           (xii) The issue and sale of the Shares to be sold by
                  the Company hereunder, the compliance by the Company with all
                  of the provisions of this Agreement and the consummation of
                  the transactions contemplated by this Agreement will not
                  conflict with or result in a breach or violation of any of the
                  terms or provisions of, or constitute a default under, any
                  indenture, mortgage, deed of trust, loan agreement or other
                  agreement or instrument to which the Company or any of the
                  Subsidiaries is a party or by which the Company or any of the
                  Subsidiaries is bound or to which any of the property or
                  assets of the Company or any of the Subsidiaries is subject,
                  nor will such action result in any violation of the provisions
                  of the Restated Certificate of Incorporation and Restated
                  Bylaws of the Company, the charter documents of any of the
                  Subsidiaries or any statute or any order, rule or regulation
                  of any court or governmental agency or body or any stock
                  exchange authorities (hereinafter "Governmental Agency")
                  having jurisdiction over the Company or any of the
                  Subsidiaries or any of their properties; and no consent,
                  approval, authorization, order, registration or qualification
                  (hereinafter referred to as "Government Authorization") of or

 
                                        4

<PAGE>   5



                  with any such Governmental Agency is required for the issue
                  and sale of the Shares or the consummation by the Company of
                  the transactions contemplated by this Agreement, except (A)
                  the registration under the Securities Act of the Shares, (B)
                  such Governmental Authorizations as have been duly obtained
                  and are in full force and effect and copies of which have been
                  furnished to you and (C) such Governmental Authorizations as
                  may be required under state securities or Blue Sky laws or the
                  Bylaws, rules and regulations of the National Association of
                  Securities Dealers, Inc.;

                           (xiii) The compliance by the Company with all the
                  provisions of the Intercompany Agreements and the consummation
                  of the transactions contemplated by the Intercompany
                  Agreements will not conflict with or result in a breach or
                  violation of any of the terms or provisions of, or constitute
                  a default under, any indenture, mortgage, deed of trust, loan
                  agreement or other agreement or instrument to which the
                  Company or any of the Subsidiaries is a party or by which the
                  Company or any of the Subsidiaries is bound or to which any of
                  the property or assets of the Company or any of the
                  Subsidiaries is subject, nor will such action result in any
                  violation of the provisions of the Restated Certificate of
                  Incorporation or Restated Bylaws of the Company, the charter
                  documents of any of the Subsidiaries or any statute or any
                  order, rule or regulation of any Governmental Agency having
                  jurisdiction over the Company or any of the Subsidiaries or
                  any of their properties, except such Governmental
                  Authorizations as have been duly obtained and are in full
                  force and effect and copies of which have been furnished to
                  you;

                           (xiv) The Company and each of the Subsidiaries are
                  (i) in compliance with any and all applicable foreign,
                  federal, state, provincial and local laws and regulations
                  relating to the protection of human health and safety, the
                  environment or hazardous or toxic substances or wastes,
                  pollutants or contaminants ("Environmental Laws"), (ii) have
                  received all permits, licenses or other approvals required of
                  them under applicable Environmental Laws to conduct their
                  respective businesses and (iii) are in compliance with all
                  terms and conditions of any such permit, license or approval,
                  except as disclosed in the Prospectus and except where such
                  noncompliance with Environmental Laws, failure to receive
                  required permits, licenses or other approvals or failure to
                  comply with the terms and conditions of such permits, licenses
                  or approvals could not, singly or in the aggregate, have a
                  Material Adverse Effect;

                           (xv) Neither the Company nor any of the Subsidiaries
                  is in violation of its certificate of incorporation or in
                  default in the performance or observance of any material
                  obligation, agreement, covenant or condition contained in any
                  indenture, mortgage, deed of trust, loan agreement, government
                  contract, lease or other agreement or instrument to which it
                  is a party or by which it or any of its properties may be
                  bound;

                           (xvi) Neither the Company nor any of the Subsidiaries
                  has taken, directly or indirectly, any action which was
                  designed to or which has constituted or which might reasonably
                  be expected to cause or result in stabilization or
                  manipulation of the price of any security of the Company to
                  facilitate the sale or resale of the Shares;

                           (xvii) The statements set forth in the Prospectus
                  under the caption "Description of Capital Stock," insofar as
                  they purport to constitute a summary of the terms of the
                  Common Stock, and under the captions "Management's Discussion
                  and Analysis of Financial Condition and Results of Operations
                  -- Liquidity and Capital Resources," "Management,"

 
                                        5

<PAGE>   6



                  and "Relationship with OYO Japan and Related Transactions,"
                  insofar as they purport to describe the provisions of the
                  laws, agreements, contracts, indentures, leases or other
                  documents or instruments referred to therein, are accurate and
                  fair summaries of the material and relevant provisions
                  thereof;

                           (xviii) Other than as set forth in the Prospectus,
                  there are no legal or governmental proceedings pending to
                  which the Company or any of the Subsidiaries is a party or of
                  which any property of the Company or any of the Subsidiaries
                  is the subject which, if determined adversely to the Company
                  or any of the Subsidiaries, could, singly or in the aggregate,
                  have a Material Adverse Effect; and, to the best of the
                  Company's knowledge, no such proceedings are threatened or
                  contemplated by any Governmental Agency or threatened by
                  others;

                           (xix) The Company is not and, after giving effect to
                  the offering and sale of the Shares, will not be an
                  "investment company" or an entity "controlled" by an
                  "investment company", as such terms are defined in the
                  Investment Company Act of 1940, as amended (the "Investment
                  Company Act");

                           (xx) Except as disclosed in the Prospectus, the
                  Company and each of the Subsidiaries owns or possesses, has
                  applied for or can acquire on reasonable terms, the patents,
                  patent rights, licenses, inventions, copyrights, knowhow
                  (including trade secrets and other unpatented and/or
                  unpatentable proprietary or confidential information, systems
                  or procedures), trademarks, service marks and trade names
                  (collectively, "Patent and Proprietary Rights") presently
                  employed by it in connection with the business now operated by
                  it, except where the failure to apply for or acquire any such
                  Patent and Proprietary Rights would not, singly or in the
                  aggregate, result in a Material Adverse Effect, and neither
                  the Company nor any of the Subsidiaries has received any
                  notice or is otherwise aware of any infringement of or
                  conflict with asserted rights of others with respect to any
                  Patent and Proprietary Rights, or of any facts which would
                  render any Patent and Proprietary Rights invalid or inadequate
                  to protect the interests of the Company therein, and which
                  infringement or conflict (if the subject of any unfavorable
                  decision, ruling or finding) or invalidity or inadequacy,
                  singly or in the aggregate, could have a Material Adverse
                  Effect;

                           (xxi) The Company and each of the Subsidiaries have
                  all licenses, franchises, permits, authorizations, approvals
                  and orders and other concessions (hereinafter referred to as
                  the "Licenses") of and from all Governmental Agencies that are
                  necessary to conduct their businesses as described in the
                  Prospectus; and neither the Company nor any of the
                  Subsidiaries is in violation of any License except where the
                  failure to have such Licenses or where such violations could
                  not, singly or in the aggregate, have a Material Adverse
                  Effect;

                           (xxii) Coopers & Lybrand L.L.P., who have certified
                  certain financial statements of the Company and the
                  Subsidiaries, are independent public accountants as required
                  by the Securities Act and the rules and regulations of the
                  Commission thereunder;

   
                           (xxiii) The consolidated financial statements and
                  related notes and schedules included in the Registration
                  Statement, a Preliminary Prospectus or in the Prospectus
                  present fairly, in all material respects, the financial 
                  position of the Company and the Subsidiaries, on the basis 
                  stated in the Registration Statement, as of the respective 
                  dates thereof and the results of operations and cash flows 
                  of the Company and the Subsidiaries, for the respective 
                  periods covered thereby,
    

 
                                        6

<PAGE>   7



                  and have been prepared in conformity with United States
                  generally accepted accounting principles applied on a
                  consistent basis throughout the entire period involved, except
                  as otherwise disclosed in the Registration Statement,
                  Preliminary Prospectus or the Prospectus. The financial
                  information set forth under the heading "Selected Financial
                  Data" in the Registration Statement, a Preliminary Prospectus
                  or the Prospectus presents fairly, in all material respects,
                  the information shown therein and has been compiled on a basis
                  consistent with that of the audited financial statements of
                  the Company included therein. No other financial statements or
                  schedules of the Company and the Subsidiaries are required by
                  the Securities Act, the Exchange Act or the Securities Act
                  Regulations to be included in the Registration Statement,
                  Preliminary Prospectus or Prospectus;

                           (xxiv) Each of the Company and the Subsidiaries,
                  directly or indirectly, maintains insurance covering its
                  properties, operations, personnel and businesses; in the
                  Company's reasonable judgment, such insurance provides
                  coverage against such losses and risks as is adequate in
                  accordance with customary industry practice to protect the
                  Company and its businesses; neither the Company nor any of the
                  Subsidiaries has received notice from any insurer or agent of
                  such insurer that substantial capital improvements or other
                  expenditures will have to be made in order to continue such
                  insurance; all such insurance is outstanding and duly in
                  force;

                           (xxv) The Company, each of the Subsidiaries and the
                  Selling Stockholder is in compliance with the provisions of
                  applicable law, regulation, or order governing payments to
                  government officials, government employees, political parties,
                  and political party officials; neither the Company, any of the
                  Subsidiaries, nor the Selling Stockholder has, directly or
                  indirectly, made any payment or delivered any item of value to
                  or for the benefit of any governmental official, government
                  employee, political party, or political party official or
                  other party on their behalf, in violation of applicable law,
                  regulation or order of the United States;

                           (xxvi) No person has any right to the registration of
                  any security of the Company by reason of the filing of the
                  Registration Statement with the Commission or the consummation
                  of the transactions contemplated hereby that has not been
                  waived or lapsed;

                           (xxvii) As of the date of the Prospectus, neither the
                  Company nor any of the Subsidiaries is currently planning any
                  probable acquisitions for which disclosure of pro forma
                  financial information would be required by the Securities Act;

                           (xxviii) Neither the Company nor any of the
                  Subsidiaries is involved in any organized labor dispute, nor,
                  to the knowledge of the Company, is any such dispute
                  threatened;

                           (xxix) The Company and each of the Subsidiaries have
                  filed all foreign, federal, state and local tax returns that
                  are required to be filed or have obtained extensions thereof
                  and have paid all taxes shown on such returns and all
                  assessments received by them to the extent that the same have
                  become due.

         (b) The Selling Stockholder represents and warrants to, and agrees
with, each of the Underwriters and the Company that:


 
                                        7

<PAGE>   8



                           (i) The Selling Stockholder is a corporation duly
                  incorporated, validly existing and in good standing under the
                  laws of the State of Texas;

                           (ii) Each Preliminary Prospectus, at the time of
                  filing thereof, conformed in all material respects to the
                  requirements of the Securities Act and the rules and
                  regulations of the Commission thereunder, and did not contain
                  an untrue statement of a material fact or omit to state a
                  material fact required to be stated therein or necessary to
                  make the statements therein, in the light of the circumstances
                  under which they were made, not misleading; provided, however,
                  that this representation and warranty shall not apply to any
                  statements or omissions made in reliance upon and in
                  conformity with information furnished in writing to the
                  Company by an Underwriter through Rauscher Pierce Refsnes,
                  Inc. expressly for use therein;

                           (iii) The Registration Statement conforms, and the
                  Prospectus and any further amendments or supplements to the
                  Registration Statement or the Prospectus will conform, in all
                  material respects to the requirements of the Securities Act
                  and the Securities Act Regulations and do not and will not, as
                  of the applicable effective date as to the Registration
                  Statement and any amendment thereto and as of the applicable
                  filing date as to the Prospectus and any amendment or
                  supplement thereto, contain an untrue statement of a material
                  fact or omit to state a material fact required to be stated
                  therein or necessary to make the statements therein not
                  misleading, provided, however, that this representation and
                  warranty shall not apply to any statements or omissions made
                  in reliance upon and in conformity with information furnished
                  in writing to the company by an Underwriter through Rauscher
                  Pierce Refsnes, Inc. expressly for use therein;

                           (iv) All Governmental Authorizations required for the
                  sale and delivery of the Shares to be sold by the Selling
                  Stockholder hereunder and for the execution and delivery by
                  the Selling Stockholder of the Intercompany Agreements and
                  this Agreement, have been obtained, except (A) the
                  registration under the Securities Act of the Shares, (B) such
                  Governmental Authorizations as have been duly obtained and are
                  in full force and effect and copies of which have been
                  delivered to you and (C) such Governmental Authorizations as
                  may be required under state securities or Blue Sky laws or the
                  Bylaws, rules and regulations of the National Association of
                  Securities Dealers, Inc.; and the Selling Stockholder has full
                  corporate right, power and authority to sell, assign, transfer
                  and deliver the Shares to be sold by the Selling Stockholder
                  hereunder; and the Selling Stockholder has full corporate
                  right, power and authority to enter into the Intercompany
                  Agreements and this Agreement;

                           (v) No Government Authorization of or with any
                  Governmental Agency is required for the issue and sale of the
                  Shares, effecting the consummation by the Company and the
                  Selling Stockholder of the transactions contemplated by this
                  Agreement, except (A) the registration under the Securities
                  Act of the Shares, (B) such Governmental Authorizations as
                  have been duly obtained and are in full force and effect and
                  copies of which have been furnished to you and (C) such
                  Governmental Authorizations as may be required under state
                  securities or Blue Sky laws or the Bylaws, rules and
                  regulations of the National Association of Securities Dealers,
                  Inc.;

                           (vi) No Government Authorization of or with any
                  Governmental Agency is required for the consummation by the
                  Company, the Selling Stockholder and OYO Japan of the
                  transactions contemplated by the Intercompany Agreements,
                  except such Governmental

 
                                        8

<PAGE>   9



                  Authorizations as have been duly obtained and are in full
                  force and effect and copies of which have been furnished to
                  you;

                           (vii) The execution and delivery of, and the
                  performance by the Selling Stockholder of its obligations
                  under, each of the Intercompany Agreements has been duly and
                  validly authorized by the Selling Stockholder; and the
                  Intercompany Agreements have been duly executed and delivered
                  by either the Selling Stockholder or OYO Japan, as the case
                  may be, and constitute the valid and legally binding agreement
                  of the Selling Stockholder or OYO Japan, as the case may be,
                  enforceable against the Selling Stockholder or OYO Japan, as
                  the case may be, in accordance with their terms, except
                  insofar as the enforceability thereof may be limited by
                  bankruptcy, insolvency, reorganization, moratorium or other
                  similar laws now or hereafter in effect relating to creditors'
                  rights generally and may be subject to general principles of
                  equity, regardless of whether such enforceability is
                  considered in a preceding in equity or at law;

                           (viii) The sale of the Shares to be sold by the
                  Selling Stockholder hereunder, the compliance by the Selling
                  Stockholder with all of the provisions of this Agreement and
                  the consummation of the transactions herein contemplated will
                  not conflict with or result in a breach or violation of any of
                  the terms or provisions of, or constitute a default under, any
                  statute, indenture, mortgage, deed of trust, loan agreement or
                  other agreement or instrument to which the Selling Stockholder
                  or any of its subsidiaries is a party or by which the Selling
                  Stockholder or any of its subsidiaries is bound, or to which
                  any of the property or assets of the Selling Stockholder or
                  any of its subsidiaries is subject, nor will such action
                  result in any violation of the provisions of the Articles of
                  Incorporation and Bylaws or such similar charter documents of
                  the Selling Stockholder or any statute or any order, rule or
                  regulation of any Governmental Agency having jurisdiction over
                  the Selling Stockholder or any of its subsidiaries or any of
                  their property; and no Government Authorization of or with any
                  Governmental Agency is required for the sale of the Shares or
                  the consummation by the Selling Stockholder of the
                  transactions contemplated by this Agreement, except (A) the
                  registration under the Securities Act of the Shares, (B) such
                  Governmental Authorizations as have been duly obtained and are
                  in full force and effect and copies of which have been
                  furnished to you and (C) such Governmental Authorizations as
                  may be required under state securities or Blue Sky laws or the
                  Bylaws, rules and regulations of the National Association of
                  Securities Dealers, Inc.;

                           (ix) The compliance by the Selling Stockholder with
                  all of the provisions of the Intercompany Agreements and the
                  consummation of the transactions therein contemplated will not
                  conflict with or result in a breach or violation of any of the
                  terms and provisions of, or constitute a default under, any
                  statute, indenture, mortgage, deed of trust, loan agreement or
                  other agreement or instrument to which the Selling Stockholder
                  or any of its subsidiaries is a party or by which the Selling
                  Stockholder or any of its subsidiaries is bound, or to which
                  any of the property or assets of the Company or any of its
                  subsidiaries is subject, nor will such action result in any
                  violation of the provisions of the Articles of Incorporation
                  and Bylaws or such similar charter documents of the Selling
                  Stockholder or any statute or any order, rule or regulation of
                  any Governmental Agency having jurisdiction over the Selling
                  Stockholder or any of its subsidiaries or any of their
                  property, except such Governmental Authorizations as have been
                  duly obtained and are in full force and effect and copies of
                  which have been furnished to you;

 
                                        9

<PAGE>   10



                           (x) The Selling Stockholder has, and immediately
                  prior to each Time of Delivery (as defined in Section 4
                  hereof) the Selling Stockholder will have, good and valid
                  title to the Shares to be sold by the Selling Stockholder
                  hereunder, free and clear of all liens, encumbrances, equities
                  or claims; and, upon delivery of such Shares and payment
                  therefor pursuant hereto and thereto, good and valid title to
                  such Shares, free and clear of all liens, encumbrances,
                  equities or claims, will pass to the several Underwriters;

                           (xi) This Agreement has been duly authorized,
                  executed, and delivered by the Selling Stockholder;

                           (xii) The Selling Stockholder has not taken and will
                  not take, directly or indirectly, any action which is designed
                  to or which has constituted or which might reasonably be
                  expected to cause or result in stabilization or manipulation
                  of the price of any security of the Company to facilitate the
                  sale or resale of the Shares;

                           (xiii) Certificates in negotiable form representing
                  all of the Shares to be sold by the Selling Stockholder
                  hereunder have been prepared and will be delivered to you in
                  accordance with the instructions in accordance with Section 4
                  of this Agreement; and

                           (xiv) The Shares to be sold by the Selling
                  Stockholder are subject to the interests of the Underwriters
                  hereunder; the obligations of the Selling Stockholder
                  hereunder shall not be terminated by operation of law, whether
                  by dissolution, or by the occurrence of any other event; if
                  the Selling Stockholder should be dissolved, or if any other
                  such event should occur, before the delivery of the Shares
                  hereunder, certificates representing the Shares shall be
                  delivered by or on behalf of the Selling Stockholder in
                  accordance with the terms and conditions of this Agreement.

         2.       Subject to the terms and conditions herein set forth, (a) 
each of the Company and the Selling Stockholder agrees, severally and not
jointly, to sell to each of the Underwriters, and each of the Underwriters
agrees, severally and not jointly, to purchase from each of the Company and the
Selling Stockholder, at a purchase price per Share of $............, the number
of Firm Shares as set forth opposite their respective names in Schedule I
hereto; provided, however, that the Company and the Selling Stockholder shall
not be obligated to sell any Shares unless all of the Firm Shares are purchased
by the Underwriters, and (b) in the event and to the extent that the
Underwriters shall exercise the election to purchase Optional Shares as provided
below, each of the Company and the Selling Stockholder agrees, severally and not
jointly, to sell to each of the Underwriters, and each of the Underwriters
agrees, severally and not jointly, to purchase from the Company, at the purchase
price per Share set forth in clause (a) of this Section 2, that portion of the
number of Optional Shares as to which such election shall have been exercised
(to be adjusted by you so as to eliminate fractional shares) determined by
multiplying such number of Optional Shares by a fraction the numerator of which
is the maximum number of Optional Shares which such Underwriter is entitled to
purchase as set forth opposite the name of such Underwriter in Schedule I hereto
and the denominator of which is the maximum number of Optional Shares that all
of the Underwriters are entitled to purchase hereunder.

         Each of the Company and the Selling Stockholder, as and to the extent
indicated in Schedule I hereto, hereby grants to the Underwriters the right to
purchase at their election up to 150,000 Optional Shares each (300,000 Optional
Shares in the aggregate), at the purchase price per Share set forth in the
paragraph above, for the sole purpose of covering overallotments in the sale of
the Firm Shares. Any such election to purchase Optional Shares shall be made pro
rata in proportion to the maximum number of Optional Shares to be sold

 
                                       10

<PAGE>   11



by each of the Company and the Selling Stockholder as set forth in Schedule I
hereto. Any such election to purchase Optional Shares may be exercised only by
written notice from you to the Company and the Selling Stockholder, given within
a period of 30 calendar days after the date of this Agreement and setting forth
the aggregate number of Optional Shares to be purchased and the date on which
such Optional Shares are to be delivered, as determined by you but in no event
earlier than the First Time of Delivery (as defined in Section 4 hereof) or,
unless you and the Company and the Selling Stockholder otherwise agree in
writing, earlier than two or later than ten business days after the date of such
notice.

         3. Upon the authorization by you of the release of the Firm Shares, the
several Underwriters propose to offer the Firm Shares for sale upon the terms
and conditions set forth in the Prospectus.

         4. (a) The Shares to be purchased by each Underwriter hereunder, in
         definitive form, and in such authorized denominations and registered in
         such names as Rauscher Pierce Refsnes, Inc. may request upon at least
         forty-eight hours' notice to the Company and the Selling Stockholder
         prior to Time of Delivery (as defined below) (the "Notification Time"),
         shall be delivered by or on behalf of the Company and the Selling
         Stockholder to Rauscher Pierce Refsnes, Inc., for the account of such
         Underwriter, against payment by or on behalf of such Underwriter of the
         purchase price therefor by wire transfer payable to the order of the
         Company or the Selling Stockholder, as the case may be, in immediately
         available funds. The Company and the Selling Stockholder will cause the
         certificates representing the Shares to be made available for checking
         and packaging at least twenty-four hours prior to the Time of Delivery
         (as defined blow) with respect thereto at the office of Rauscher Pierce
         Refsnes, Inc., 2711 N. Haskell Ave., Suite 2400, Dallas, Texas
         75204-2936 or such other designated location (the "Designated Office").

                  The time and date of such delivery and payment shall be, with
         respect to the Firm Shares, 9:30 a.m., Central Standard Time, on
         November__, 1997 or such other time and date as Rauscher Pierce
         Refsnes, Inc. and the Company and the Selling Stockholder may agree
         upon in writing, and, with respect to the Optional Shares, 9:30 a.m.,
         Central Standard Time, on the date specified by Rauscher Pierce
         Refsnes, Inc. in the written notice given by Rauscher Pierce Refsnes,
         Inc. of the Underwriters' election to purchase such Optional Shares, or
         such other time and date as Rauscher Pierce Refsnes, Inc. and the
         Company and the Selling Stockholder may agree upon in writing. Such
         time and date for delivery of the Firm Shares is herein called the
         "First Time of Delivery", such time and date for delivery of the
         Optional Shares, if not the First Time of Delivery, is herein called
         the "Second Time of Delivery", and each such time and date for delivery
         is herein called a "Time of Delivery".

                  (b) The documents to be delivered at each Time of Delivery by
         or on behalf of the parties hereto pursuant to Section 7 hereof,
         including the cross-receipt for the Shares and any additional documents
         requested by the Underwriters pursuant to Section 7(k) hereof, will be
         delivered at the offices of Vinson & Elkins L.L.P., 1001 Fannin, Suite
         3600, Houston, Texas 77002 (the "Closing Location"), and the Shares
         will be delivered as specified in Section 4 above, all at such Time of
         Delivery. A meeting will be held at the Closing Location at 2:00 p.m.,
         Central Standard Time, on the New York Business Day next preceding such
         Time of Delivery, at which meeting the final drafts of the documents to
         be delivered pursuant to the preceding sentence will be available for
         review by the parties hereto. For the purposes of this Section 4, "New
         York Business Day" shall mean each Monday, Tuesday, Wednesday, Thursday
         and Friday which is not a day on which banking institutions in New York
         are generally authorized or obligated by law or executive order to
         close.


 
                                       11

<PAGE>   12



         5. The Company and, with respect to clauses (e) and (i) below, the 
Selling Stockholder agree with each of the Underwriters:

                  (a) To prepare the Prospectus in a form approved by you (such
         approval not to be unreasonably withheld or delayed) and to file such
         Prospectus pursuant to Rule 424(b) under the Securities Act not later
         than the Commission's close of business on the second business day
         following the execution and delivery of this Agreement, or, if
         applicable, such earlier time as may be required by Rule 430A(a)(3)
         under the Securities Act; to advise you promptly of the necessity to
         make, and to make further amendments or supplements to the Registration
         Statement or Prospectus in such form as has been previously approved by
         you (such approval not to be unreasonably withheld or delayed); to
         advise you, promptly after it receives notice thereof, of the time when
         any amendment to the Registration Statement has been filed or becomes
         effective or any supplement to the Prospectus or any amended Prospectus
         has been filed and to furnish you copies thereof; to file promptly all
         reports required to be filed by the Company with the Commission
         pursuant to Section 13(a), 13(c) or 15(d) of the Exchange Act
         subsequent to the date of the Prospectus and for so long as the
         delivery of a prospectus is required in connection with the offering or
         sale of the Shares; to advise you, promptly after it receives notice
         thereof, of the issuance by the Commission of any stop order or of any
         order preventing or suspending the use of any Preliminary Prospectus or
         prospectus, of the suspension of the qualification of the Shares for
         offering or sale in any jurisdiction, of the initiation or threatening
         of any proceeding for any such purpose, or of any request by the
         Commission for the amending or supplementing of the Registration
         Statement or Prospectus or for additional information; and, in the
         event of the issuance of any stop order or of any order preventing or
         suspending the use of any Preliminary Prospectus or prospectus or
         suspending any such qualification, promptly to use its best efforts to
         obtain the withdrawal of such order;

                  (b) Promptly from time to time to take such action as you may
         reasonably request to qualify the Shares for offering and sale under
         the securities laws of the United States and to comply with such laws
         so as to permit the continuance of sales and dealings therein in such
         jurisdictions for as long as may be necessary to complete the
         distribution of the Shares but in no event more than nine months from
         the date hereof provided that in connection therewith the Company shall
         not be required to qualify as a foreign corporation or to file a
         general consent to service of process in any jurisdiction;

                  (c) To furnish the Underwriters with copies of the Prospectus
         in such quantities as you may from time to time reasonably request,
         and, if the delivery of a prospectus is required at any time prior to
         the expiration of nine months after the time of issue of the Prospectus
         in connection with the offering or sale of the Shares by the
         Underwriters and if at such time any events shall have occurred as a
         result of which the Prospectus as then amended or supplemented would
         include an untrue statement of a material fact or omit to state any
         material fact necessary in order to make the statements therein, in the
         light of the circumstances under which they were made when such
         Prospectus is delivered, not misleading, or, if for any other reason it
         shall be necessary during such period to amend or supplement the
         Prospectus in order to comply with the Securities Act, to notify you
         and upon your request to prepare and furnish without charge to each
         Underwriter and to any dealer in securities as many copies as you may
         from time to time reasonably request of an amended Prospectus or a
         supplement to the Prospectus which will correct such statement or
         omission or effect such compliance, and in case any Underwriter is
         required to deliver a prospectus in connection with sales of any of the
         Shares at any time after nine months or more after the time of issue of
         the Prospectus, upon your request but at the expense of such
         Underwriter, to prepare and deliver to such Underwriter as many

 
                                       12

<PAGE>   13



         copies as you may request of an amended or supplemented Prospectus 
         complying with Section 10(a)(3) of the Securities Act;

                  (d) To make generally available to its securityholders as soon
         as practicable, but in any event not later than eighteen months after
         the effective date of the Registration Statement (as defined in Rule
         158(c) under the Securities Act), an earnings statement of the Company
         and the Subsidiaries (which need not be audited) complying with Section
         11(a) of the Securities Act and the rules and regulations of the
         Commission thereunder (including, at the option of the Company, Rule
         158);

                  (e) During the period beginning from the date hereof and
         continuing to and including the date 120 days after the date of the
         Prospectus, not to offer, sell, contract to sell or otherwise dispose
         of, except as provided hereunder, any securities of the Company that
         are substantially similar to the Shares, including but not limited to
         any securities that are convertible into or exchangeable for, or that
         represent the right to receive, Common Stock or any such substantially
         similar securities (other than pursuant to employee stock incentive
         plans existing on, or upon the conversion or exchange of convertible or
         exchangeable securities outstanding as of, the date of this Agreement,
         or in connection with the acquisition of any business or property so
         long as the recipient of any Common Stock shall agree not to resell
         such Common Stock during the 120 day period), without the prior written
         consent of Rauscher Pierce Refsnes, Inc.;

                  (f) During a period of five years from the effective date of
         the Registration Statement, to furnish to the Company's stockholders
         such reports as are or may be prescribed by the Commission;

                  (g) During a period of five years from the effective date of
         the Registration Statement, to furnish to you copies of all reports or
         other communications (financial or other) furnished to Stockholders,
         and to deliver to you as soon as they are available, copies of any
         reports and financial statements of the Company furnished to or filed
         with the Commission or any securities exchange on which any class of
         securities of the Company is listed;

                  (h) To use the net proceeds received by it from the sale of
         the Shares pursuant to this Agreement in the manner specified in the
         Prospectus under the caption "Use of Proceeds";

                  (i) Not to (and to cause each of the Subsidiaries not to)
         take, directly or indirectly, any action which is designed to or which
         constitutes or which might reasonably be expected to cause or result in
         stabilization or manipulation of the price of any security of the
         Company or facilitate the sale or resale or the Shares; and

                  (j) To use its best efforts to list, subject to notice of
         issuance, the Shares on the Nasdaq National Market.

         6. The Company covenants and agrees with the several Underwriters that
the Company will pay or cause to be paid, to the extent not otherwise previously
paid by the Selling Stockholder, the following: (i) the fees, disbursements and
expenses of the Company's counsel and accountants in connection with the
registration of the Shares under the Securities Act and all other expenses in
connection with the preparation, printing and filing of the Registration
Statement, any Preliminary Prospectus and the Prospectus and amendments and
supplements thereto and the mailing and delivering of copies thereof to the
Underwriters and dealers; (ii) the cost of printing or producing any Agreement
among Underwriters, this Agreement, the Selling Agreements, the Blue Sky
Memorandum, closing documents (including compilations thereof) and any other

 
                                       13

<PAGE>   14



documents in connection with the offering, purchase, sale and delivery of the
Shares; (iii) all expenses in connection with the qualification of the Shares
for offering and sale under state securities laws as provided in Section 5
hereof, including the fees and disbursements of counsel for the Underwriters in
connection with such qualification and in connection with the Blue Sky survey;
(iv) all fees and expenses in connection with listing the Shares on the Nasdaq
National Market; (v) the filing fees incident to, and the fees and disbursements
of counsel for the Underwriters in connection with, securing any required review
by the National Association of Securities Dealers, Inc. of the terms of the sale
of the Shares; (vi) the fees and expenses of the Authorized Agent (as defined in
Section 15 hereof); (vii) the cost of preparing share certificates; (viii) the
cost and charges of any transfer agent or registrar; (ix) all other costs and
expenses incident to the performance of its obligations hereunder which are not
otherwise specifically provided for in this Section; (x) any fees and expenses
of counsel for the Selling Stockholder, (xi) all expenses and taxes incident to
the sale and delivery of the Shares to be sold by the Selling Stockholder to the
Underwriters hereunder and (xii) an accountable expense allowance of $75,000 to
the Underwriters, which amount shall be payable upon, and only in the event of,
the issuance and sale by the Company to the Underwriters of the Firm Shares. It
is understood, however, that, except as specifically provided in this Section,
Sections 8 and 11, the Underwriters will pay all of their own costs and
expenses, including the fees and disbursements of their counsel, transfer taxes
on resale of any of the Shares by them, and any advertising expenses with any
offers they may make.

         7. The obligations of the Underwriters hereunder, as to the Shares to
be delivered at each Time of Delivery shall be subject, in their discretion, to
the condition that all representations and warranties and other statements of
the Company and of the Selling Stockholder herein are, at and as of such Time of
Delivery, true and correct, the condition that the Company and the Selling
Stockholder shall have performed all of its and their obligations hereunder
theretofore to be performed, and the following additional conditions:

                  (a) The Prospectus shall have been filed with the Commission
         pursuant to Rule 424(b) within the applicable time period prescribed
         for such filing by the rules and regulations under the Securities Act
         and in accordance with Section 5(a) hereof; no stop order suspending
         the effectiveness of the Registration Statement or any part thereof
         shall have been issued and no proceeding for that purpose shall have
         been initiated or threatened by the Commission and all requests for
         additional information on the part of the Commission shall have been
         complied with to your reasonable satisfaction;

                  (b) Vinson & Elkins L.L.P., counsel for the Underwriters,
         shall have furnished to you such opinion or opinions, dated such Time
         of Delivery, in form and substance satisfactory to you, and such
         counsel shall have received such papers and information as they may
         reasonably request to enable them to pass upon such matters;

                  (c) Fulbright & Jaworski L.L.P., counsel for the Company and
         the Selling Stockholder, shall have furnished to you their written
         opinion, dated such Time of Delivery, in form and substance
         satisfactory to you, to the effect that:

                           (i) Each of the Company, the Subsidiaries and the
                  Selling Stockholder has been duly incorporated and is validly
                  existing as a corporation in good standing under the laws of
                  its jurisdiction of incorporation, with corporate power and
                  authority to own its properties and conduct its business as
                  described in the Prospectus;

                           (ii) Each of the Company, the Subsidiaries and the
                  Selling Stockholder has been duly qualified as a foreign
                  corporation for the transaction of business and is in good
                  standing under the laws of each other jurisdiction in which it
                  owns or leases properties, or conducts any

 
                                       14

<PAGE>   15



                  business, so as to require such qualification, other than
                  where the failure to be so qualified or in good standing would
                  not result in a material adverse change in or affecting the
                  general affairs, management, prospects, current or future
                  consolidated financial position, stockholders' equity or
                  results of operations of the Company and the Subsidiaries,
                  taken as a whole, or the Selling Stockholder, as the case may
                  be;

                           (iii) This Agreement has been duly executed and
                  delivered by the Company and the Selling Stockholder;

                           (iv) All of the issued shares of capital stock of the
                  Company (including the Shares being delivered to the
                  Underwriters on the Closing Date or the Additional Closing
                  Date, as the case may be, against payment therefor in
                  accordance with the Agreement) have been duly authorized and
                  validly issued, are fully paid and nonassessable and have not
                  been issued in violation of or subject to any preemptive
                  rights arising under the Company's Restated Certificate of
                  Incorporation or Restated Bylaws or under the General
                  Corporation Law of the State of Delaware or, to the knowledge
                  of such counsel, similar rights that entitle or will entitle
                  any person to acquire any shares of Common Stock upon issuance
                  of such shares of capital stock by the Company;

   
                           (v) All offers and sales of the Company's capital
                  stock prior to the date hereof were made in compliance with or
                  were the subject of an available exemption from the
                  registration provisions of the Securities Act and all other
                  applicable federal laws or regulations or the General
                  Corporation Law of the State of Delaware, or any actions, in
                  respect of any such offers or sales are effectively barred by
                  effective waivers or statutes of limitation;
    

   
                           (vi) The execution, delivery and performance by the
                  Company and the Selling Stockholder of this Agreement and the
                  issuance and sale of the Shares being delivered at such Time
                  of Delivery to be sold by the Company and the Selling
                  Stockholder and to be delivered at such Time of Delivery does
                  not and will not conflict with or result in a breach or
                  violation of any of the terms or provisions of, or constitute
                  a default under, any indenture, mortgage, deed of trust, loan
                  agreement or other material agreement or instrument known to
                  such counsel after due inquiry to which the Company, any of
                  the Subsidiaries or the Selling Stockholder is a party or by
                  which the Company, any of the Subsidiaries or the Selling
                  Stockholder is bound or to which any of the property or assets
                  of the Company, any of the Subsidiaries or the Selling
                  Stockholder is subject, nor will such action result in a
                  violation of any statute or any order, rule or regulation
                  (other than federal or state securities or Blue Sky laws, as
                  to which such counsel need not express any opinion with
                  respect to this paragraph) known to such counsel of any
                  Governmental Agency having jurisdiction over the Company, any
                  of the Subsidiaries or the Selling Stockholder or any of their
                  properties;
    

   
                           (vii) The execution, delivery and performance by the
                  Company of the Intercompany Agreements does not and will not
                  conflict with or result in a breach or violation of any of the
                  terms or provisions of, or constitute a default under, any
                  indenture, mortgage, deed of trust, loan agreement or other
                  material agreement or instrument known to such counsel after
                  due inquiry to which the Company, any of the Subsidiaries or
                  the Selling Stockholder is a party or by which the Company,
                  any of the Subsidiaries or the Selling Stockholder is bound or
                  to which any of the
    

 
                                       15

<PAGE>   16



                  property or assets of the Company, any of the Subsidiaries or 
                  the Selling Stockholder is subject;

                           (viii) No Governmental Authorization is required for
                  the issuance and sale of the Shares by the Company or the sale
                  of the Shares by the Selling Stockholder or the consummation
                  by the Company or the Selling Stockholder (or OYO Japan in the
                  case of the Intercompany Agreements) of the transactions
                  contemplated by the Intercompany Agreements and this
                  Agreement, except the registration under the Securities Act of
                  the Shares, and such consents, approvals, authorizations,
                  registrations or qualifications as may be required under state
                  securities or Blue Sky laws or the Bylaws, rules and
                  regulations of the National Association of Securities Dealers,
                  Inc. in connection with the purchase and distribution of the
                  Shares by the Underwriters;

                           (ix) The authorized capital stock of the Company
                  conforms as to legal matters in all material respects to the
                  description thereof contained in the Prospectus;

                           (x) The statements in the Prospectus under the
                  captions "Description of Capital Stock" and "Shares Eligible
                  for Future Sale," and in the Registration Statement in Items
                  14 and 15, insofar as such statements constitute a summary of
                  the terms of the Common Stock, legal matters or documents or
                  proceedings referred to therein, accurately present the
                  information called for with respect to such terms, legal
                  matters, documents or proceedings in all material respects;

                           (xi) Such counsel has reviewed all agreements,
                  contracts, indentures, leases or other documents or
                  instruments described in the Registration Statement and the
                  Prospectus under the captions "Management's Discussion and
                  Analysis of Financial Condition and Results of Operations --
                  Liquidity and Capital Resources," "Management," "Relationship
                  With OYO Japan and Related Transactions" and "Shares Eligible
                  for Future Sale" and such agreements, contracts, indentures,
                  leases or other documents or instruments are fairly summarized
                  or described therein in all material respects, and filed as
                  exhibits to the Registration Statement as required;

                           (xii) To such counsel's knowledge and other than as
                  set forth in the Prospectus, there are no legal or
                  governmental proceedings pending to which the Company, any of
                  the Subsidiaries or the Selling Stockholder is a party or of
                  which any property of the Company, any of the Subsidiaries or
                  the Selling Stockholder is the subject which, if determined
                  adversely to the Company, any of the Subsidiaries or the
                  Selling Stockholder would individually or in the aggregate
                  have a material adverse effect on the current or future
                  consolidated financial position, Stockholders' equity or
                  results of operations of the Company and the Subsidiaries,
                  taken as a whole, or the Selling Stockholder; and, to such
                  counsel's knowledge, no such proceedings are threatened or
                  contemplated by any Governmental Agency or threatened by
                  others;

                           (xiii) To the knowledge of such counsel, no holders
                  of securities of the Company have rights to the registration
                  thereof under the Registration Statement or, if any such
                  holders have such rights, such holders have waived such
                  rights;


 
                                       16

<PAGE>   17



                           (xiv) Neither the Company nor the Selling Stockholder
                  is an "investment company" or an entity "controlled" by an
                  "investment company", as such terms are defined in the
                  Investment Company Act;

                           (xv) The Selling Stockholder has full right, power
                  and authority to sell, assign, transfer and deliver such
                  Shares hereunder;

                           (xvi) Assuming that the Selling Stockholder acquired
                  its interest in the Shares in good faith and without notice of
                  any adverse claims, upon delivery of the Shares registered in
                  its name to the Underwriters in the State of Texas, the
                  Underwriters will acquire all of the Selling Stockholder's
                  rights in the Shares free of any adverse claims (within the
                  meaning of Section 8-302 of the Texas UCC).

                           (xvii) The Registration Statement has become
                  effective under the Securities Act, and, to such counsel's
                  knowledge, no stop order suspending the effectiveness of the
                  Registration Statement or any part thereof has been issued and
                  no proceedings for that purpose have been instituted or are
                  pending under the Securities Act

                           (xviii) The Registration Statement and the Prospectus
                  and any further amendments and supplements thereto made by the
                  Company prior to such Time of Delivery (other than the
                  financial statements and related schedules , as to which such
                  counsel need express no opinion) comply as to form in all
                  material respects with the requirements of the Securities Act
                  and the rules and regulations thereunder; such counsel may
                  state that because the primary purpose of their engagement was
                  not to establish or confirm factual matters or financial,
                  accounting or statistical matters and because of the wholly or
                  partially non-legal character of many of the statements
                  contained in the Registration Statement and the Prospectus,
                  such counsel is not passing upon and does not assume any
                  responsibility for the accuracy, completeness or fairness of
                  the statements contained in the Registration Statement or the
                  Prospectus (except to the extent expressly set forth in
                  paragraphs (x) and (xi) above), and they have not
                  independently verified the accuracy, completeness or fairness
                  of such statements (except as aforesaid). Without limiting the
                  foregoing, such counsel may state that they assume no
                  responsibility for and have not independently verified the
                  accuracy, completeness or fairness of the financial statements
                  included in the Registration Statement and the Prospectus and
                  they have not examined the accounting or financial records
                  from which such statements and data are derived. Such counsel
                  may state that although certain portions of the Registration
                  Statement and the Prospectus have been included therein on the
                  authority of "experts" within the meaning of the Securities
                  Act, they are not experts with respect to any portion of the
                  Registration Statement or the Prospectus. However, such
                  counsel may state that they have participated in conferences
                  with officers, legal counsel and other representatives of the
                  Company, representatives of the independent accountants of the
                  Company, and with representatives of, and legal counsel for,
                  the Underwriters, at which the contents of the Registration
                  Statement and Prospectus and related matters were discussed.
                  Such counsel may state that they have also reviewed certain
                  corporate documents furnished to them by the Company. Based on
                  such participation and review (relying as to materiality to a
                  certain extent upon the officers and the other representatives
                  of the Company), and subject to the limitations described
                  above, such counsel may state that they advise the
                  Underwriters that no facts have come to their attention that
                  causes them to believe that the Registration Statement at the
                  time it became effective, contained an untrue statement of a
                  material fact or omitted to

 
                                       17

<PAGE>   18



                  state a material fact required to be stated therein or
                  necessary to make the statements therein not misleading, or
                  that the Prospectus, as of its date or as of the date hereof,
                  contained or contains an untrue statement of a material fact
                  or omitted or omits to state a material fact necessary to make
                  the statements therein, in the light of the circumstances
                  under which they were made, not misleading; and such counsel
                  may state that to their knowledge there are no contracts or
                  other documents of a character required to be filed as an
                  exhibit to the Registration Statement which are not filed as
                  required.

         In rendering such opinion, such counsel may rely as to matters of fact
upon representations and warranties contained herein, and certificates of
officers of the Company and the Selling Stockholder, among other things, and may
state that they express no opinion as to the laws of any jurisdiction other than
federal law, the laws of the State of Texas and the General Corporation Law of
the State of Delaware;

                  (d) On the date of the Prospectus of a time prior to the
         execution of this Agreement, at 9:30 a.m., Central Standard Time, on
         the effective date of any post-effective amendment to the Registration
         Statement filed subsequent to the date of this Agreement and also at
         each Time of Delivery, Coopers & Lybrand L.L.P. shall have furnished to
         you a letter or letters, dated the respective dates on delivery
         thereof, in form and substance satisfactory to you, to the effect set
         forth in Annex I hereto;

                  (e) (i) Neither the Company nor any of the Subsidiaries shall
         have sustained since the date of the latest audited financial
         statements included in the Prospectus any material loss or interference
         with its business from fire, explosion, flood or other calamity,
         whether or not covered by insurance, or from any organized labor
         dispute or court or governmental action, order or decree, otherwise
         than as set forth or contemplated in the Prospectus, and (ii) since the
         respective dates as of which information is given in the Prospectus
         there shall not have been any change in the capital stock or any
         increase in long-term debt of the Company or any of the Subsidiaries,
         taken as a whole, or any material adverse change, or any development
         involving a probable prospective material adverse change, in or
         affecting the general affairs, management, financial position,
         stockholders' equity or results of operations of the Company and the
         Subsidiaries, taken as a whole, otherwise than as set forth or
         contemplated in the Prospectus, the effect of which, in any such case
         described in Clause (i) or (ii), is in the judgment of Rauscher Pierce
         Refsnes, Inc. so material and adverse as to make it impracticable or
         inadvisable to proceed with the public offering or the delivery of the
         Shares being delivered at such Time of Delivery on the terms and in the
         manner contemplated in the Prospectus;

                  (f) On or after the date hereof there shall not have occurred
         any of the following: (i) a suspension or material limitation in
         trading in securities generally on the New York Stock Exchange, Nasdaq
         National Market or any other nationally recognized exchange; (ii) a
         suspension or material limitation in trading in the Company's
         securities on the Nasdaq National Market; (iii) a general moratorium on
         commercial banking activities in New York or Texas declared by the
         relevant authorities; or (iv) the outbreak of hostilities involving the
         United States, or the declaration by the United States of a national
         emergency or war, if the effect of any such event specified in this
         Clause (iv) in the judgment of the Representatives makes it
         impracticable or inadvisable to proceed with the public offering or the
         delivery of the Shares being delivered at such Time of Delivery on the
         terms and in the manner contemplated in the Prospectus;

                  (g) The Shares to be sold by the Company and the Selling
         Stockholder at such Time of Delivery shall have been duly approved for
         inclusion on the Nasdaq National Market, subject to official notice of
         issuance;

 
                                       18

<PAGE>   19



                  (h) The Company and the Selling Stockholder shall have
         furnished or caused to be furnished to you at such Time of Delivery
         certificates of officers of the Company and of the Selling Stockholder,
         respectively, in their respective capacities as such, satisfactory to
         you as to the accuracy of the representations and warranties of the
         Company and the Selling Stockholder, respectively, herein at and as of
         such Time of Delivery, as to the performance by the Company and the
         Selling Stockholder of all of their respective obligations hereunder to
         be performed at or prior to such Time of Delivery, and as to such other
         matters as you may reasonably request, and the Company shall have
         furnished or caused to be furnished certificates as to the matters set
         forth in subsections (a) and (g) of this Section, and as to such other
         matters as you may reasonably request;

                  (i) The Company has obtained and delivered to the Underwriters
         executed copies of an agreement from each of the executive officers and
         directors of the Company, substantially to the effect set forth in
         Subsection 5(e) hereof in form and substance satisfactory to you; and

                  (j) In order to document the Underwriters' compliance with the
         reporting and withholding provisions of the Tax Equity and Fiscal
         Responsibility Act of 1982 with respect to the transaction herein
         contemplated, the Selling Stockholder will deliver to the Underwriters
         prior to the first Time of Delivery (as hereinafter defined) a properly
         completed and executed United States Treasury Department Form W-9 or
         Form W-8 (or other applicable form or statement specified by Treasury
         Department regulations in lieu thereof);

                  8. (a) The Company and the Selling Stockholder, jointly and
         severally, will indemnify and hold harmless each Underwriter against
         any losses, claims, damages or liabilities, joint or several, to which
         such Underwriter may become subject, under the Securities Act or
         otherwise, insofar as such losses, claims, damages or liabilities (or
         actions in respect thereof) arise out of or are based upon an untrue
         statement or alleged untrue statement of a material fact contained in
         any Preliminary Prospectus, the Registration Statement or the
         Prospectus, any amendment or supplement thereto, or arise out of or are
         based upon the omission or alleged omission to state therein a material
         fact required to be stated therein or necessary to make the statements
         therein, in the light of the circumstances under which they are made,
         not misleading, and will reimburse each Underwriter for any legal or
         other expenses reasonably incurred by such Underwriter in connection
         with investigating or defending any such action or claim as such
         expenses are incurred; provided, however, that the Company and the
         Selling Stockholder shall not be liable in any such case to the extent
         that any such loss, claim, damage or liability arises out of or is
         based upon an untrue statement or alleged untrue statement or omission
         or alleged omission made in any Preliminary Prospectus, the
         Registration Statement or the Prospectus or any such amendment or
         supplement in reliance upon and in conformity with written information
         furnished to the Company by any Underwriter through Rauscher Pierce
         Refsnes, Inc. expressly for use therein; provided, further, that the
         liability of the Selling Stockholder pursuant to this subsection (a)
         shall not exceed the product of the number of Shares sold by the
         Selling Stockholder including any Optional Shares and the initial
         public offering price of the Shares as set forth in the Prospectus.

                  (b) In connection with the Reserve Share Program, the Company
         and the Selling Stockholder, jointly and severally, agree to indemnify
         and hold harmless the Underwriters from and against any and all losses,
         expenses and liabilities incurred by them as a result of the failure of
         the designated employees or other persons to pay for and accept
         delivery of Shares which, immediately following effectiveness of the
         Registration Statement, were subject to a properly confirmed agreement
         to purchase.


 
                                       19

<PAGE>   20



                  (c) Each Underwriter will indemnify and hold harmless the
         Company and the Selling Stockholder against any losses, claims, damages
         or liabilities to which the Company or the Selling Stockholder may
         become subject, under the Securities Act or otherwise, insofar as such
         losses, claims, damages or liabilities (or actions in respect thereof)
         arise out of or are based upon an untrue statement or alleged untrue
         statement of a material fact contained in any Preliminary Prospectus,
         the Registration Statement or the Prospectus, or any amendment or
         supplement thereto, or arise out of or are based upon the omission or
         alleged omission to state therein a material fact required to be stated
         therein or necessary to make the statements therein not misleading, in
         each case to the extent, but only to the extent, that such untrue
         statement or alleged untrue statement or omission or alleged omission
         was made in any Preliminary Prospectus, the Registration Statement or
         the Prospectus or any such amendment or supplement in reliance upon and
         in conformity with written information furnished to the Company by such
         Underwriter through Rauscher Pierce Refsnes, Inc. expressly for use
         therein; and will reimburse the Company and the Selling Stockholder for
         any legal or other expenses reasonably incurred by the Company or the
         Selling Stockholder in connection with investigating or defending any
         such action or claim as such expenses are incurred.

                  (d) Promptly after receipt by an indemnified party under
         subsection (a), (b) or (c) above of notice of the commencement of any
         action, such indemnified party shall, if a claim in respect thereof is
         to be made against an indemnifying party under such subsection, notify
         the indemnifying party in writing of the commencement thereof; but the
         omission so to notify the indemnifying party shall not relieve it from
         any liability which it may have to any indemnified party otherwise than
         under such subsection. In case any such action shall be brought against
         any indemnified party and it shall notify the indemnifying party of the
         commencement thereof, the indemnifying party shall be entitled to
         participate therein and, to the extent that it shall wish, jointly with
         any other indemnifying party similarly notified, to assume the defense
         thereof, with counsel satisfactory to such indemnified party (which
         shall not, except with the consent of the indemnified party, be counsel
         to the indemnifying party), and, after notice from the indemnifying
         party to such indemnified party of its election so to assume the
         defense thereof, the indemnifying party shall not be liable to such
         indemnified party under such subsection for any legal expenses of other
         counsel or any other expenses, in each case subsequently incurred by
         such indemnified party, in connection with the defense thereof other
         than reasonable costs of investigation. No indemnifying party shall,
         without the written consent of the indemnified party, effect the
         settlement or compromise of, or consent to the entry of any judgment
         with respect to, any pending or threatened action or claim in respect
         of which indemnification or contribution may be sought hereunder
         (whether or not the indemnified party is an actual or potential party
         to such action or claim) unless such settlement, compromise or judgment
         (i) includes an unconditional release of the indemnified party from all
         liability arising out of such action or claim and (ii) does not include
         a statement as to or an admission of fault, culpability or a failure to
         act, by or on behalf of any indemnified party.

                  (e) If the indemnification provided for in this Section 8 is
         unavailable to or insufficient to hold harmless an indemnified party
         under subsection (a), (b) or (c) above in respect of any losses,
         claims, damages or liabilities (or actions in respect thereof) referred
         to therein, then each indemnifying party shall contribute to the amount
         paid or payable by such indemnified party as a result of such losses,
         claims, damages or liabilities (or actions in respect thereof) in such
         proportion as is appropriate to reflect the relative benefits received
         by the Company and the Selling Stockholder on the one hand and the
         Underwriters on the other from the offering of the Shares. If, however,
         the allocation provided by the immediately preceding sentence is not
         permitted by applicable law or if the indemnified party failed to give
         the notice required under subsection (d) above, then each indemnifying
         party shall

 
                                       20

<PAGE>   21



         contribute to such amount paid or payable by such indemnified party in
         such proportion as is appropriate to reflect not only such relative
         benefits but also the relative fault of the Company and the Selling
         Stockholder on the one hand and the Underwriters on the other in
         connection with the statements or omissions which resulted in such
         losses, claims, damages or liabilities (or actions in respect thereof),
         as well as any other relevant equitable considerations. The relative
         benefits received by the Company and the Selling Stockholder on the one
         hand and the Underwriters on the other shall be deemed to be in the
         same proportion as the total net proceeds from the offering of the
         Shares purchased under this Agreement (before deducting expenses)
         received by the Company and the Selling Stockholder bear to the total
         underwriting discounts and commissions received by the Underwriters
         with respect to the Shares purchased under this Agreement, in each case
         as set forth in the table on the cover page of the Prospectus. The
         relative fault shall be determined by reference to, among other things,
         whether the untrue or alleged untrue statement of a material fact or
         the omission or alleged omission to state a material fact relates to
         information supplied by the Company or the Selling Stockholder on the
         one hand or the Underwriters on the other and the parties' relative
         intent, knowledge, access to information and opportunity to correct or
         prevent such statement or omission. The Company, the Selling
         Stockholder and the Underwriters agree that it would not be just and
         equitable if contributions pursuant to this subsection (e) were
         determined by pro rata allocation (even if the Underwriters were
         treated as one entity for such purpose) or by any other method of
         allocation which does not take account of the equitable considerations
         referred to above in this subsection (e). The amount paid or payable by
         an indemnified party as a result of the losses, claims, damages or
         liabilities (or actions in respect thereof) referred to above in this
         subsection (e) shall be deemed to include any legal or other expenses
         reasonably incurred by such indemnified party in connection with
         investigating or defending any such action or claim. Notwithstanding
         the provisions of this subsection (e), no Underwriter shall be required
         to contribute any amount in excess of the amount by which the total
         price at which the Shares underwritten by it and distributed to the
         public were offered to the public exceeds the amount of any damages
         which such Underwriter has otherwise been required to pay by reason of
         such untrue or alleged untrue statement or omission or alleged
         omission. No person guilty of fraudulent misrepresentation (within the
         meaning of Section 11(f) of the Securities Act) shall be entitled to
         contribution from any person who was not guilty of such fraudulent
         misrepresentation. The Underwriters' obligations in this subsection (e)
         to contribute are several in proportion to their respective
         underwriting obligations and not joint.

                  (f) The obligations of the Company and the Selling Stockholder
         under this Section 8 shall be in addition to any liability which the
         Company and the Selling Stockholder may otherwise have and shall
         extend, upon the same terms and conditions, to each person, if any, who
         controls any Underwriter within the meaning of the Securities Act; and
         the obligations of the Underwriters under this Section 8 shall be in
         addition to any liability which the respective Underwriters may
         otherwise have and shall extend, upon the same terms and conditions, to
         each officer and director of the Company (including any person who,
         with his or her consent, is named in the Registration Statement as
         about to become a director of the Company) and to each person, if any,
         who controls the Company or the Selling Stockholder within the meaning
         of the Securities Act.

                  9. (a) If any Underwriter shall default in its obligation to
         purchase the Shares that it has agreed to purchase hereunder at a Time
         of Delivery, you may in your discretion arrange for you or another
         party or other parties to purchase such Shares on the terms contained
         herein. If within thirty-six hours after such default by any
         Underwriter you do not arrange for the purchase of such Shares, then
         the Company and the Selling Stockholder shall be entitled to a further
         period of thirty-six hours within which to procure another party or
         other parties satisfactory to you to purchase such

 
                                       21

<PAGE>   22



         Shares on such terms. In the event that, within the respective
         prescribed periods, you notify the Company and the Selling Stockholder
         that you have so arranged for the purchase of such Shares, or the
         Company and the Selling Stockholder notify you that they have so
         arranged for the purchase of such Shares, you or the Company and the
         Selling Stockholder shall have the right to postpone such Time of
         Delivery for a period of not more than seven days, in order to effect
         whatever changes may thereby be made necessary in the Registration
         Statement or the Prospectus, or in any other documents or arrangements,
         and the Company agrees to file promptly any amendments to the
         Registration Statement or the Prospectus which in your opinion may
         thereby be made necessary. The term "Underwriter" as used in this
         Agreement shall include any person substituted under this Section with
         like effect as if such person had originally been a party to this
         Agreement with respect to such Shares.

                  (b) If, after giving effect to any arrangements for the
         purchase of the Shares of a defaulting Underwriter or Underwriters by
         you and the Company and the Selling Stockholder as provided in
         subsection (a) above, the aggregate number of such Shares which remains
         unpurchased does not exceed one-tenth of the aggregate number of all of
         the Shares to be purchased at such Time of Delivery, then the Company
         and the Selling Stockholder shall have the right to require each
         non-defaulting Underwriter to purchase the number of Shares which such
         Underwriter agreed to purchase hereunder at such Time of Delivery and,
         in addition, to require each non-defaulting Underwriter to purchase its
         pro rata share (based on the number of Shares which such Underwriter
         agreed to purchase hereunder) of the Shares of such defaulting
         Underwriter or Underwriters for which such arrangements have not been
         made; but nothing herein shall relieve a defaulting Underwriter from
         liability for its default.

                  (c) If, after giving effect to any arrangements for the
         purchase of the Shares of a defaulting Underwriter or Underwriters by
         you and the Company and the Selling Stockholder as provided in
         subsection (a) above, the aggregate number of such Shares which remains
         unpurchased exceeds one-tenth of the aggregate number of all of the
         Shares to be purchased at such Time of Delivery, or if the Company and
         the Selling Stockholder shall not exercise the right described in
         subsection (b) above to require non-defaulting Underwriters to purchase
         Shares of a defaulting Underwriter or Underwriters, then this Agreement
         (or, with respect to the Second Time of Delivery, the obligations of
         the Underwriters to purchase and of the Selling Stockholder to sell the
         Optional Shares) shall thereupon terminate, without liability on the
         part of any non-defaulting Underwriter or the Company or the Selling
         Stockholder, except for the expenses to be borne by the Company and the
         Selling Stockholder and the Underwriters as provided in Section 6
         hereof and the indemnity and contribution agreements in Section 8
         hereof; but nothing herein shall relieve a defaulting Underwriter from
         liability for its default.

         10. The respective indemnities, agreements, representations, warranties
and other statements of the Company, the Selling Stockholder and the several
Underwriters, as set forth in this Agreement or made by or on behalf of them,
respectively, pursuant to this Agreement, shall remain in full force and effect,
regardless of any investigation (or any statement as to the results thereof)
made by or on behalf of any Underwriter or any controlling person of any
Underwriter, or the Company, or the Selling Stockholder, or any officer or
director or controlling person of the Company, or any controlling person of the
Selling Stockholder, and shall survive delivery of and payment for the Shares.

         11. If this Agreement shall be terminated pursuant to Section 9 hereof,
neither the Company nor the Selling Stockholder shall then be under any
liability to any Underwriter except as provided in Sections 6 and 8 hereof; but,
if for any other reason any Shares are not delivered by or on behalf of the
Company and the

 
                                       22

<PAGE>   23



Selling Stockholder as provided herein, the Company and the Selling Stockholder
pro rata (based on the number of Shares to be sold by the Company and the
Selling Stockholder hereunder) will reimburse the Underwriters through you for
all out-of-pocket expenses approved in writing by you, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Shares not so delivered,
but the Company and the Selling Stockholder shall then be under no further
liability to any Underwriter in respect of the Shares not so delivered except as
provided in Sections 6 and 8 hereof.

         12. In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you jointly or by Rauscher Pierce Refsnes, Inc. on behalf of you as the
representatives; and in all dealings with the Selling Stockholder hereunder, you
and the Company shall be entitled to act and rely upon any statement, request,
notice or agreement on behalf of Selling Stockholder made or given by the
Selling Stockholder.

         All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to you in care of Rauscher Pierce Refsnes, Inc., 2711 N.
Haskell Ave., Suite 2400, Dallas, Texas 75204-2936, Attention: Syndicate Desk;
if to the Selling Stockholder shall be delivered or sent by mail, telex or
facsimile transmission to the Selling Stockholder at OYO Corporation U.S.A.,
7334 N. Gessner Road, Houston, Texas 77040, Attention: President; and if to the
Company shall be delivered or sent by mail, telex or facsimile transmission to
the address of the Company set forth in the Registration Statement, Attention:
Secretary; provided, however, that any notice to an Underwriter pursuant to
Section 8(d) hereof shall be delivered or sent by mail, telex or facsimile
transmission to such Underwriter at its address set forth in its Underwriters'
Questionnaire or telex constituting such Questionnaire, which address will be
supplied to the Company or the Selling Stockholder by you upon request. Any such
statements, requests, notices or agreements shall take effect upon receipt
thereof.

         13. This Agreement shall be binding upon, and inure solely to the
benefit of, the Underwriters, the Company and the Selling Stockholder and, to
the extent provided in Sections 8 and 10 hereof, the officers and directors of
the Company and each person who controls the Company, the Selling Stockholder or
any Underwriter, and their respective heirs, executors, administrators,
successors and assigns, and no other person shall acquire or have any right
under or by virtue of this Agreement. No purchaser of any of the Shares from any
Underwriter shall be deemed a successor or assign by reason merely of such
purchase.

         14. Each of the parties hereto irrevocably (i) agrees that any legal
suit, action or proceeding against the Company or the Selling Stockholder
brought by any Underwriter or by any person who controls any Underwriter arising
out of or based upon this Agreement or the transactions contemplated hereby may
be instituted in any Texas court, (ii) waives, to the fullest extent it may
effectively do so, any objection which it may now or hereafter have to the
laying of venue of any such proceeding and (iii) submits to the jurisdiction of
such courts in any such suit, action or proceeding. Each of the Company and the
Selling Stockholder has appointed CT Corporation System as its authorized agent
(the "Authorized Agent") upon whom process may be served in any such action
arising out of or based on this Agreement or the transactions contemplated
hereby which may be instituted in any Texas court by any Underwriter or by any
person who controls any Underwriter, expressly consents to the jurisdiction of
any such court in respect of any such action, and waives any other requirements
of or objections to personal jurisdiction with respect thereto. Such appointment
shall be irrevocable. Each of the Company and the Selling Stockholder represents
and warrants that the Authorized Agent has agreed to act as such agent for
service of process and agrees to take any and all action, including the filing
of any and all documents and instruments, that may be necessary to continue such
appointment in

 
                                       23

<PAGE>   24



full force and effect as aforesaid. Service of process upon the Authorized Agent
and written notice of such service to the Company and the Selling Stockholder,
as the case may be, shall be deemed, in every respect, effective service of
process upon the Company and the Selling Stockholder as the case may be.

         15. In respect of any judgment or order given or made for any amount
due hereunder that is expressed and paid in a currency (the "judgment currency")
other than United States dollars, the Company and the Selling Stockholder, as
the case may be, will indemnify each Underwriter against any loss incurred by
such Underwriter as a result of any variation as between (i) the rate of
exchange at which the United States dollar amount is converted into the judgment
currency for the purpose of such judgment or order and (ii) the rate of exchange
at which an Underwriter is able to purchase United States dollars with the
amount of the judgment currency actually received by such Underwriter. The
foregoing indemnity shall constitute a separate and independent obligation of
the Company and the Selling Stockholder and shall continue in full force and
effect notwithstanding any such judgment or order as aforesaid. The term "rate
of exchange" shall include any premiums and costs of exchange payable in
connection with the purchase of or conversion into United States dollars.

         16. Time shall be of the essence of this Agreement. As used herein, the
term "business day" shall mean any day when the Commission's office in
Washington, D.C. is open for business.

         17. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF TEXAS.

         18. This Agreement may be executed by any one or more of the parties
hereto in any number of counterparts, each of which shall be deemed to be an
original, but all such counterparts shall together constitute one and the same
instrument.



 
                                       24

<PAGE>   25



         If the foregoing is in accordance with your understanding, please sign
and return to us eight (8) counterparts hereof, and upon the acceptance hereof
by you, on behalf of each of the Underwriters, this letter and such acceptance
hereof shall constitute a binding agreement among each of the Underwriters, the
Company and the Selling Stockholder. It is understood that your acceptance of
this letter on behalf of each of the Underwriters is pursuant to the authority
set forth in a form of Agreement among Underwriters, the form of which shall be
submitted to the Company and the Selling Stockholder for examination upon
request, but without warranty on your part as to the authority of the signers
thereof.

                                Very truly yours,

                                OYO GEOSPACE CORPORATION ("COMPANY")


                                By: __________________________________________
                                         Name:
                                         Title:


                                OYO CORPORATION U.S.A. ("SELLING STOCKHOLDER")


                                By: __________________________________________
                                         Name:
                                         Title:


Accepted as of the date hereof at Dallas, Texas

RAUSCHER PIERCE REFSNES, INC.
RAYMOND JAMES & ASSOCIATES, INC.


By: __________________________________________
         (Rauscher Pierce Refsnes, Inc.)
         On behalf of each of the Underwriters


 
                                       25

<PAGE>   26



                                   SCHEDULE I

<TABLE>
<CAPTION>

                                                                                               Number of Optional Shares
                                                              Total Number of Firm            to be Purchased if Maximum
                                                             Shares to be Purchased                Option-Exercised
                                                        -------------------------------     ------------------------------
                                                                             From the                           From the
                                                           From the          Selling            From the         Selling
                                                           Company         Shareholder          Company        Shareholder
                                                       --------------------------------------------------------------------
<S>                                                     <C>                <C>               <C>              <C>
                     Underwriter
                     -----------
Rauscher Pierce Refsnes, Inc.........................
Raymond James & Associates, Inc......................










                                                          _________        __________          _________       __________
                                                                         
                                                          =========        ==========          =========       ========== 
</TABLE>



 
                                       26

<PAGE>   27



                                                                        ANNEX I



         Pursuant to Section 7(f) of the Underwriting Agreement, the accountants
shall furnish letters to the Underwriters to the effect that:

                           (i) They are independent certified public accountants
                  with respect to the Company and the Subsidiaries within the
                  meaning of the Securities Act and the applicable published
                  rules and regulations thereunder;

                           (ii) In their opinion, the financial statements and
                  any supplementary financial information and schedules (and, if
                  applicable, financial forecasts and/or pro forma financial
                  information) examined by them and included in the Prospectus
                  or the Registration Statement comply as to form in all
                  material respects with the applicable accounting requirements
                  of the Securities Act and the related published rules and
                  regulations thereunder; and, if applicable, they have made a
                  review in accordance with standards established by the
                  American Institute of Certified Public Accountants of the
                  unaudited consolidated interim financial statements, selected
                  financial data, pro forma financial information, financial
                  forecasts and/or condensed financial statements derived from
                  audited financial statements of the Company for the periods
                  specified in such letter, as indicated in their reports
                  thereon, copies of which have been separately furnished to the
                  representatives of the Underwriters (the "Representatives");

                           (iii) They have made a review in accordance with
                  standards established by the American Institute of Certified
                  Public Accountants of the unaudited condensed consolidated
                  statements of income, consolidated balance sheets and
                  consolidated statements of cash flows included in the
                  Prospectus as indicated in their reports thereon copies of
                  which have been separately furnished to the Representatives;
                  and on the basis of specified procedures including inquiries
                  of officials of the Company who have responsibility for
                  financial and accounting matters regarding whether the
                  unaudited condensed consolidated financial statements referred
                  to in paragraph (vi)(A)(i) below comply as to form in all
                  material respects with the applicable accounting requirements
                  of the Securities Act and the related published rules and
                  regulations, nothing came to their attention that caused them
                  to believe that the unaudited condensed consolidated financial
                  statements do not comply as to form in all material respects
                  with the applicable accounting requirements of the Securities
                  Act and the related published rules and regulations;

                           (iv) The unaudited selected financial information
                  with respect to the consolidated results of operations and
                  financial position of the Company for the five most recent
                  fiscal years included in the Prospectus agrees with the
                  corresponding amounts (after restatements where applicable) in
                  the audited consolidated financial statements for such five
                  fiscal years;

                           (v) They have reviewed the information in the
                  Prospectus under selected captions with the disclosure
                  requirements of Regulation S-K, carried out limited procedures
                  specified in such letter with respect to such information, and
                  compared such information with the accounting records of the
                  Company nothing came to their attention as a result of the
                  foregoing procedures that caused them to believe that this
                  information does not conform;


 
                                        1

<PAGE>   28



                           (vi) On the basis of limited procedures, not
                  constituting an examination in accordance with generally
                  accepted auditing standards, consisting of a reading of the
                  unaudited financial statements and other information referred
                  to below, a reading of the latest available interim financial
                  statements of the Company and the Subsidiaries, inspection of
                  the minute books of the Company and the Subsidiaries since the
                  date of the latest audited financial statements included in
                  the Prospectus, inquiries of officials of the Company and the
                  Subsidiaries responsible for financial and accounting matters
                  and such other inquiries and procedures as may be specified in
                  such letter, nothing came to their attention that caused them
                  to believe that:

                           (A) (i) the unaudited consolidated statements of
                  income, consolidated balance sheets and consolidated
                  statements of cash flows included in the Prospectus do not
                  comply as to form in all material respects with the applicable
                  accounting requirements of the Securities Act and the related
                  published rules and regulations, or (ii) any material
                  modifications should be made to the unaudited condensed
                  consolidated statements of income, consolidated balance sheets
                  and consolidated statements of cash flows included in the
                  Prospectus for them to be in conformity with generally
                  accepted accounting principles;

                           (B) any other unaudited income statement data and
                  balance sheet items included in the Prospectus do not agree
                  with the corresponding items in the unaudited consolidated
                  financial statements from which such data and items were
                  derived, and any such unaudited data and items were not
                  determined on a basis substantially consistent with the basis
                  for the corresponding amounts in the audited consolidated
                  financial statements included in the Prospectus;

                           (C) the unaudited financial statements which were not
                  included in the Prospectus but from which were derived any
                  unaudited condensed financial statements referred to in Clause
                  (A) and any unaudited income statement data and balance sheet
                  items included in the Prospectus and referred to in Clause (B)
                  were not determined on a basis substantially consistent with
                  the basis for the audited consolidated financial statements
                  included in the Prospectus;

                           (D) any unaudited pro forma consolidated condensed
                  financial statements included in the Prospectus do not comply
                  as to form in all material respects with the applicable
                  accounting requirements of the Securities Act and the
                  published rules and regulations thereunder or the pro forma
                  adjustments have not been properly applied to the historical
                  amounts in the compilation of those statements;

                           (E) as of a specified date not more than five days
                  prior to the date of such letter, there have been any changes
                  in the consolidated capital stock (other than issuances of
                  capital stock upon exercise of options and stock appreciation
                  rights, upon earn-outs of performance shares and upon
                  conversions of convertible securities, in each case which were
                  outstanding on the date of the latest financial statements
                  included in the Prospectus) or any increase in the
                  consolidated long-term debt of the Company and the
                  Subsidiaries, or any decreases in consolidated net current
                  assets or stockholders' equity or other items specified by the
                  Representatives, or any increases in any items specified by
                  the Representatives, in each case as compared with amounts
                  shown in the latest balance sheet included in the Prospectus,

 
                                        2

<PAGE>   29


                  except in each case for changes, increases or decreases which
                  the Prospectus discloses have occurred or may occur or which
                  are described in such letter; and

                           (F) for the period from the date of the latest
                  financial statements included in the Prospectus to the
                  specified date referred to in Clause (E) there were any
                  decreases in consolidated net revenues or operating profit or
                  the total or per share amounts of consolidated net income or
                  other items specified by the Representatives, or any increases
                  in any items specified by the Representatives, in each case as
                  compared with the comparable period of the preceding year and
                  with any other period of corresponding length specified by the
                  Representatives, except in each case for decreases or
                  increases which the Prospectus discloses have occurred or may
                  occur or which are described in such letter; and

                           (vii) In addition to the examination referred to in
                  their report(s) included in the Prospectus and the limited
                  procedures, inspection of minute books, inquiries and other
                  procedures referred to in paragraphs (iii) and (vi) above,
                  they have carried out certain specified procedures, not
                  constituting an examination in accordance with generally
                  accepted auditing standards, with respect to certain amounts,
                  percentages and financial information specified by the
                  Representatives, which are derived from the general accounting
                  records of the Company and the Subsidiaries, which appear in
                  the Prospectus, or in Part II of, or in exhibits and schedules
                  to, the Registration Statement specified by the
                  Representatives, and have compared certain of such amounts,
                  percentages and financial information with the accounting
                  records of the Company and the Subsidiaries and have found
                  them to be in agreement.







 
                                        3




<PAGE>   1
                                                                     EXHIBIT 5.1



                   [FULBRIGHT & JAWORSKI L.L.P. LETTERHEAD]



                              November 17, 1997



OYO Geospace Corporation
7334 N. Gessner Road
Houston, Texas  77040

Ladies and Gentlemen:

             We refer to the Registration Statement on Form S-1 (Registration
No. 333-36727), as amended (the "Registration Statement"), filed by OYO
Geospace Corporation, a Delaware corporation (the "Company"), with the
Securities and Exchange Commission under the Securities Act of 1933, relating
to (i) the offer by the Company of 1,000,000 shares of the Company's Common
Stock, par value $.01 per share (the "Common Stock"), and up to 150,000 shares
of Common Stock that may be sold by the Company in the event the underwriters
for the offering elect to exercise their over-allotment option and (ii) the
offer by the selling stockholder of the Company listed in the Registration
Statement (the "Selling Stockholder") of 1,000,000 shares of Common Stock and
up to 150,000 shares of Common Stock that may be sold by the Selling
Stockholders in the event the underwriters for the offering elect to exercise
their over-allotment option.

             As counsel to the Company, we have examined such corporate
records, documents and questions of law as we have deemed necessary or
appropriate for the purposes of this opinion.  In such examinations, we have
assumed the genuineness of signatures and the conformity to the originals of
the documents supplied to us as copies.  As to various questions of fact
material to this opinion, we have relied upon statements and certificates of
officers and representatives of the Company.

             Upon the basis of such examination, we are of the opinion that:

                     (i) The 1,150,000 shares of Common Stock offered by the
             Company, when sold in accordance with the terms agreed upon in the
             Underwriting Agreement filed as Exhibit 1.1 to the Registration
             Statement, will be legally issued, fully paid and nonassessable.
<PAGE>   2
OYO Geospace Corporation
November 17, 1997
Page 2



                     (ii) The 1,150,000 shares of Common Stock offered by the
             Selling Stockholder have been legally issued and are fully paid
             and nonassessable.

             We consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement and to the reference to this firm under the caption
"Legal Matters" in the prospectus contained therein.  This consent is not to be
construed as an admission that we are a person whose consent is required to be
filed with the Registration Statement under the provisions of the Securities
Act of 1933.


                                                 Very truly yours,

                                                 /s/ Fulbright & Jaworski L.L.P.

                                                 Fulbright & Jaworski L.L.P.

<PAGE>   1
                                                                    EXHIBIT 10.7


                              INDEMNITY AGREEMENT


         THIS AGREEMENT is made as of the ______ day of November, 1997, between
Oyo Geospace Corporation, a Delaware corporation ("Corporation") and
__________________________ ("Indemnified Party").

                             W I T N E S S E T H :

         WHEREAS, Indemnified Party is, or is about to become, a member of the
Board of Directors or an officer of the Corporation and in such capacity is
performing a valuable service for Corporation;

         WHEREAS, Indemnified Party may from time to time serve as a director,
officer, employee or agent of other corporations, partnerships, joint ventures,
trusts or other enterprises, entities or plans at the request of Corporation in
order to pursue Corporation's interests;

         WHEREAS, the Bylaws (the "Bylaws") of Corporation provide for the
mandatory indemnification of the officers, directors, agents and employees of
Corporation to the maximum extent authorized by Section 145 of the Delaware
General Corporation Statute, as amended hereafter (the "State Statute");

         WHEREAS, such Bylaws and the State Statute specifically provide that
they are not exclusive and thereby contemplate that contracts or other
arrangements not inconsistent with the State Statute may be entered into
between Corporation and the members of its Board of Directors and its officers
with respect to indemnification of such directors and officers;

         WHEREAS, in accordance with the authorization provided by the State
Statute, Corporation is purchasing and will maintain a policy of Directors' and
Officers' Liability Insurance ("D&O Insurance"), covering certain liabilities
which may be incurred by its directors and officers in the performance of their
services for Corporation, possibly including certain liabilities for which
indemnification by the Corporation is not authorized or permitted under the
State Statute;

         WHEREAS, uncertainties with respect to the terms and availability of
D&O Insurance and with respect to the application, amendment and enforcement of
statutory and by-law indemnification provisions make it desirable to supplement
and enhance the adequacy and reliability of the protection afforded to
directors and officers thereby;

         WHEREAS, Corporation is in the process of accomplishing an initial
public offering ("IPO") of its common stock and desires to recruit new
directors and to continue the service of its existing directors to Corporation
as a public company;
<PAGE>   2
         WHEREAS, in order to supplement and enhance the protection afforded
Indemnified Party and to induce Indemnified Party to serve as a member of the
Board of Directors or as an officer of Corporation at and after the IPO (and to
be named as a director or person consenting to be a director in the IPO
documents), Corporation has determined and agreed to enter into this contract
with Indemnified Party, which contract has been approved and adopted by
Corporation's Board and such Board action has been ratified by Corporation's
sole stockholder; and

         WHEREAS, this contract has been so approved and ratified but shall not
become effective until the day one day prior to the consummation of the IPO;

         NOW, THEREFORE, in consideration of Indemnified Party's continued
service as a director or an officer of Corporation after the date hereof the
parties hereto agree as follows:

1.       DEFINITIONS.

         "Litigation Costs" means costs, charges, expenses and obligations,
         including, without limitation, all bonds, expenses of investigation,
         fees and expenses of experts, accountants or other professionals,
         travel and lodging expenses, and attorneys' fees and expenses,
         reasonably incurred or contracted for in the investigation, defense or
         prosecution of or other involvement in any Proceeding and any appeal
         therefrom, and all costs of appeal, attachment, supersedeas and other
         bonds that may be relevant to any Proceeding.

         "Losses" means the total of all amounts which Indemnified Party
         becomes, or may become, legally obligated to pay in connection with
         any Proceeding, including (without limitation) judgments, penalties,
         fines, court or investigative costs, amounts paid in settlement,
         amounts lost or ordered forfeited pursuant to injunctive sanctions,
         and all Litigation Costs.

         "Proceeding" means any threatened, pending or completed action, suit,
         proceeding, subpoena compliance, inquiry or investigation, whether
         civil, criminal, administrative or investigative (whether external and
         involving outside parties or internal to the Corporation, including,
         but not limited to, an action by or in the right of the Corporation
         and any internal investigation conducted by the Board of Directors or
         any committee or other designee thereof or any other person), and
         whether formal or informal.

2.       INDEMNITY OF INDEMNIFIED PARTY.  Corporation hereby agrees to
         indemnify Indemnified Party to the fullest extent authorized or
         permitted by the provisions of the State Statute, including, but not
         limited to, (i) the maximum extent permitted by the provisions of such
         Statute which provide that such Statute is not the exclusive basis for
         indemnification of directors and officers and (ii) the maximum extent
         authorized or permitted by any amendment thereof or other statutory
         provision authorizing or permitting such indemnification which is
         adopted after the date hereof.





                                       2
<PAGE>   3
3.       ADDITIONAL INDEMNITY.  In addition to and not in substitution for or
         diminution of the obligations of indemnification set forth in Section
         2 hereof, Corporation  hereby further agrees to indemnify Indemnified
         Party, to the fullest extent permitted by law, against any and all
         Litigation Costs and Losses of Indemnified Party in connection with
         any Proceeding to which Indemnified Party is, was or at any time
         becomes a party, or is threatened to be made a party or otherwise
         becomes involved (other than as plaintiff except where being a
         plaintiff or intervenor is necessary to avoid res judicata or
         collateral estoppel or other estoppel or other result as to matters
         which may adversely impact Indemnified Party) by reason of the fact
         that Indemnified Party is, was or at any time becomes a director,
         officer, employee or agent of Corporation, or is or was serving or at
         any time serves at the request of Corporation as a director, officer,
         employee or agent of another corporation, partnership, joint venture,
         trust or other enterprise or any benefit plan related to the business
         and affairs of Corporation, and specifically including any Proceeding
         brought pursuant to the provisions of Section 16(b) of the Securities
         Exchange Act of 1934 (the "1934 Act") or any other provision under the
         1934 Act and the Securities Act of 1933 and the rules and regulations
         thereunder.

4.       LIMITATIONS ON INDEMNITY.  No amounts of Indemnity pursuant to Section
         2 or 3 hereof shall be paid by Corporation:

         (a)     Except to the extent the aggregate of Litigation Costs and
                 Losses in any Proceeding or group of related Proceedings to be
                 indemnified thereunder exceeds the amount of Litigation Costs
                 and Losses for which the Indemnified Party actually receives
                 indemnification payments or on whose behalf indemnification
                 payments are made pursuant to any D&O Insurance policy or from
                 any other source;

         (b)     On account of any payments required to be paid by an
                 Indemnified Party as a result of any Proceeding in which a
                 final, non-appealable judgment is rendered against Indemnified
                 Party for an accounting or disgorgement of profits made from
                 the purchase or sale by Indemnified Party of securities of
                 Corporation pursuant to the provisions of Section 16(b) of the
                 1934 Act;

         (c)     On account of Indemnified Party's conduct which is finally
                 adjudged in any Proceeding to have been knowingly fraudulent,
                 deliberately dishonest or an act or omission involving willful
                 misconduct;

         (d)     If a final non-appealable decision by a court having
                 jurisdiction over the parties and the subject matter shall
                 determine that such indemnification is not lawful.

5.       CONTINUATION OF INDEMNITY.  All agreements and obligations of
         Corporation contained herein shall continue during the period
         Indemnified Party is a director, officer, employee or agent of
         Corporation (or is or was serving at the request of Corporation as a
         director, officer, employee or agent of another corporation,
         partnership, joint venture, trust or other enterprise or any benefit





                                       3
<PAGE>   4
         plan related to the business and affairs of Corporation or of any of
         its affiliates, subsidiaries, associates or other entities in which it
         is interested) and shall continue thereafter so long as Indemnified
         Party shall be subject to any possible Litigation Costs or Losses in
         any Proceeding by reason of the fact that Indemnified Party was a
         director, officer, employee or agent of Corporation (or is or was
         serving at the request of Corporation as a director, officer, employee
         or agent of another corporation, partnership, joint venture, trust or
         other enterprise or any such benefit plan).

6.       NOTIFICATION AND DEFENSE OF CLAIM.  Promptly after receipt by
         Indemnified Party of notice of the commencement of any Proceeding,
         Indemnified Party will, if a claim in respect thereof is to be made
         against Corporation under this Agreement, give reasonable notice to
         Corporation of the commencement thereof; but the omission so to notify
         Corporation will not relieve Corporation from any liability which it
         may have to Indemnified Party unless Corporation can demonstrate by
         clear and convincing evidence that it was materially prejudiced by the
         failure to receive such notice.  With respect to any such Proceeding
         as to which Indemnified Party becomes involved:

         (a)     Corporation will be entitled to participate therein at its 
                 own expense; and

         (b)     Except as otherwise provided below, to the extent that it may
                 wish, Corporation may, jointly with any other indemnifying
                 party, assume the defense thereof, with outside counsel which
                 must be reasonably satisfactory to Indemnified Party.  After
                 notice from Corporation to Indemnified Party of its election
                 so to assume the defense thereof (and consent of Indemnified
                 Party as to Corporation's choice of outside counsel, which
                 consent will not be unreasonably withheld), Corporation will
                 be liable to Indemnified Party under this Agreement for all
                 Litigation Costs (subject to Section 4 above and other than as
                 provided below with respect to attorneys' fees) incurred in
                 connection therewith.  Indemnified Party shall have the right
                 to employ personal counsel in such Proceeding, but the fees
                 and expenses of such counsel incurred after notice from
                 Corporation of its assumption of the defense thereof (and
                 consent of Indemnified Party as to Corporation's choice of
                 outside counsel) shall be at the expense of Indemnified Party,
                 unless (i) the employment of counsel for Indemnified Party has
                 been authorized by Corporation, (ii) Indemnified Party shall
                 have concluded in good faith that there may be a conflict of
                 interest between Corporation and Indemnified Party in the
                 conduct of the defense (or part of the defense) of such
                 action, or (iii) Corporation shall not in fact have employed
                 counsel to assume the defense of such action, in each of which
                 cases the fees and expenses of counsel shall be at the expense
                 of Corporation.  Corporation shall not be entitled to assume
                 the defense of any Proceeding brought by or on behalf of
                 Corporation or as to which Indemnified Party shall have made
                 the conclusion provided for in (ii) above; and

         (c)     Corporation shall not be liable to indemnify Indemnified Party
                 under this Agreement for any Losses paid in settlement of any
                 Proceeding or claim





                                       4
<PAGE>   5
                 effected without its written consent.  Corporation shall not
                 settle any Proceeding or claim in any manner which would
                 impose any penalty, sanction or limitation on Indemnified
                 Party, or otherwise effectively indicate the existence of any
                 wrongful act by Indemnified Party, without Indemnified Party's
                 written consent.  Neither Corporation nor Indemnified Party
                 will unreasonably withhold its consent to any proposed
                 settlement.  Without intending to limit the circumstances in
                 which it would be unreasonable for Corporation to withhold its
                 consent to a settlement, the parties hereto agree it would be
                 unreasonable for Corporation to withhold its consent to a
                 settlement in an amount that did not exceed, in the business
                 judgment of the Board of Directors of Corporation, the
                 estimated amount of Litigation Costs of Indemnified Party to
                 litigate the Proceeding to conclusion, provided that there is
                 no other materially adverse consequence to Corporation from
                 such settlement.

7.       NO PRESUMPTIONS.  The termination of any Proceeding by judgment,
         order, settlement, conviction or upon a plea of nolo contendere or its
         equivalent, shall not, of itself, create a presumption (i) that
         Indemnified Party did not act in good faith, (ii) with respect to any
         criminal action or proceeding, that Indemnified Party had reasonable
         cause to believe that his conduct constituted a criminal violation or
         (iii) that Indemnified Party was knowingly fraudulent, deliberately
         dishonest or committed an act, or made an omission, involving willful
         misconduct.

8.       MANDATORY ADVANCEMENT OF EXPENSES.  At the request of Indemnified
         Party, Litigation Costs incurred or contracted for by him in any
         Proceeding shall be paid by Corporation on a continuing and current
         basis, in advance of the final disposition of such matter, with the
         undertaking which Indemnified Party makes hereby that if it shall be
         ultimately determined that Indemnified Party was not entitled to be
         indemnified therefor, or was not entitled to be fully indemnified
         therefor, Indemnified Party shall repay to Corporation the amount, or
         appropriate portion thereof, so advanced.  Such advancement and
         current payment of Litigation Costs by Corporation shall be made
         promptly (but in any event within 10 days) after receipt by
         Corporation of Indemnified Party's request therefor.

9.       REPAYMENT OF EXPENSES.  Indemnified Party agrees that Indemnified
         Party will reimburse Corporation for all Litigation Costs paid by
         Corporation in connection with any Proceeding in which Indemnified
         Party is involved in the event and only to the extent that it shall be
         ultimately determined by final non-appealable judgment of a court of
         competent jurisdiction that Indemnified Party is not entitled to be
         indemnified by Corporation for such Litigation Costs under the
         provisions of the State Statute, the Bylaws and this Agreement.

10.      PROCEDURE.

         (a)     Indemnification hereunder shall be made promptly, and in any
                 event within thirty days of Indemnified Party's written
                 request therefor, unless





                                       5
<PAGE>   6
                 (i) an affirmative determination is made reasonably and within
                 such thirty-day period by Corporation in the manner provided
                 in subsection (b) below, that Indemnified Party is not
                 entitled to indemnity hereunder for any reason other than as
                 contemplated by clause (ii) of this Section 10(a), or (ii) an
                 affirmative determination is required by the State Statute or
                 other applicable law that the Indemnified Party met an
                 applicable standard of conduct, in which case the Corporation
                 will cause such determination to be made within sixty days
                 from the date of the written request for indemnity.

         (b)     The determination to be made by Corporation under subsection
                 (a) above shall be based on the facts known at the time and
                 shall be made (i) by the Board, by a majority vote of a quorum
                 consisting of directors who are not parties to the Proceeding
                 ("disinterested directors"), or (ii) if such a quorum is not
                 obtainable, by independent legal counsel in a written opinion,
                 or (iii) even if such a quorum is obtainable, by independent
                 legal counsel in a written opinion if the Board, by a majority
                 vote of a quorum consisting of disinterested directors, so
                 directs, or (iv) by the stockholders of Corporation.  Any such
                 determination may be contested by Indemnified Party as
                 hereinafter contemplated.

         (c)     A failure to make any required determination within the period
                 of time specified shall be deemed to be a determination
                 favorable to the Indemnified Party.

11.      ENFORCEMENT.

         (a)     Corporation expressly confirms and agrees that it has entered
                 into this Agreement and assumed the obligations imposed on
                 Corporation hereby and has obtained the approval of its Board
                 of Directors and the ratification of such approval by its sole
                 stockholder in order to induce Indemnified Party to serve as a
                 director or an officer of Corporation and acknowledges that
                 Indemnified Party is relying upon this Agreement in agreeing
                 to serve in such capacity.

         (b)     In the event Indemnified Party is required to bring any action
                 to enforce rights or to collect moneys due under this
                 Agreement, Corporation shall reimburse Indemnified Party, on a
                 continuing and current basis, for all of Indemnified Party's
                 reasonable fees and expenses in bringing and pursuing such
                 action and Indemnified Party shall have no obligation to
                 reimburse Corporation therefor unless Indemnified Party is not
                 successful in such action after rendition of a final,
                 non-appealable judgment by a court of competent jurisdiction.

         (c)     The right to indemnification hereunder shall be enforceable by
                 Indemnified Party in any court of competent jurisdiction if
                 Indemnified Party's claim therefor is denied, in whole or in
                 part, in the manner provided herein, or if no disposition of
                 such claim is made within sixty





                                       6
<PAGE>   7
                 days from the receipt by Corporation of Indemnified Party's
                 request for indemnification hereunder.

12.      SEVERABILITY.  Each of the provisions of this Agreement is a separate
         and distinct agreement and independent of the others so that if any
         provision hereof shall be held to be invalid or unenforceable for any
         reason, such invalidity or unenforceability shall not affect the
         validity or enforceability of the other provisions hereof.  To the
         extent necessary to effectuate this Agreement, should any provision
         hereof be held invalid or unenforceable, this Agreement shall be
         reformed in such manner as to provide the maximum indemnity
         contemplated hereby to Indemnified Party, it being the intention of
         the parties hereto that this Agreement be otherwise given its maximum
         effect consistent with the laws and, to the extent applicable, public
         policies of the State of Delaware.

13.      OBLIGATION TO AMEND.  Corporation agrees to take all actions necessary
         to amend this Agreement in the future to increase or otherwise
         maximize the indemnity protections intended to be afforded hereby to
         the extent then permitted by law.

14.      NOTICE.  Any notice, request or other communication hereunder to
         Corporation or Indemnified Party shall be in writing and delivered or
         sent by postage prepaid first class mail or by hand delivery or
         express mail service or by facsimile copy to Corporation's facsimile
         phone number as follows:  (i) if to Corporation, addressed to Oyo
         Geospace Corporation, 7334 North Gessner Road, Houston, Texas 77040,
         and (ii) if to Indemnified Party, to the address shown on the
         signature page hereof or at such other address as Indemnified Party
         shall designate from time to time to Corporation in writing.

15.      GOVERNING LAW; BINDING EFFECT; AMENDMENT AND TERMINATION.

         (a)     This Agreement shall be interpreted and enforced in accordance
                 with the laws of the State of Delaware.

         (b)     This Agreement shall be binding upon Indemnified Party and
                 upon Corporation, its successors and assigns, and shall inure
                 to the benefit of Indemnified Party, his heirs, personal
                 representatives and assigns and to the benefit of Corporation,
                 its successors and assigns.  Corporation will require any
                 successor (whether direct or indirect, by purchase, merger,
                 consolidation or otherwise) to all or any substantial part of
                 the business and/or assets of Corporation, by agreement in
                 form and substance satisfactory to Indemnified Party, to
                 expressly assume and agree to perform this Indemnification
                 Agreement in the same manner and to the same extent that
                 Corporation would be required to perform it if no such
                 succession had taken place.  Failure of Corporation to obtain
                 such agreement prior to effectiveness of any succession shall
                 be a breach of this Indemnification Agreement and shall
                 entitle Indemnified Party to appropriate equitable relief or
                 monetary damages from Corporation in an amount necessary to
                 provide Indemnified Party with the protections to which he
                 would be entitled hereunder.  As used in this Indemnification
                 Agreement, "Corporation" shall mean Corporation as
                 hereinbefore defined





                                       7
<PAGE>   8
                 and any successor to its business and/or assets as aforesaid
                 that executes and delivers the agreement provided for in this
                 Section 14 or that otherwise becomes bound by all the terms
                 and provisions of this Indemnification Agreement by operation
                 of law.

         (c)     No amendment, modification, termination or cancellation of
                 this Agreement shall be effective unless in writing signed by
                 both parties hereto.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                                         OYO GEOSPACE CORPORATION
                                       
                                       
                                         By                                    
                                           ------------------------------------
                                                    Authorized Signatory
                                       
                                       
                                                                               
                                         --------------------------------------
                                                    Indemnified Party
                                       
                                         Address:                              
                                                  -----------------------------
                                                                               
                                                  -----------------------------
                                                                               
                                                  -----------------------------





                                       8

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
     We consent to the inclusion in this registration statement on Form S-1
(File No. 333-36727), Amendment No. 2, of our reports dated November 3, 1997, on
our audits of the consolidated financial statements and financial statement
schedule of OYO Geospace Corporation, as restated to exclude, for all periods
presented, the accounts of TrueTime, Inc., formerly a wholly-owned subsidiary
that was distributed to the Company's stockholder on September 30, 1997. We also
consent to the reference to our firm under the caption "Experts."
    
 
                                          /s/ COOPERS & LYBRAND L.L.P
 
Houston, Texas
   
November 17, 1997
    


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