LINDBERG CORP /DE/
424B1, 1998-07-29
MISCELLANEOUS PRIMARY METAL PRODUCTS
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<PAGE>
 
                               1,000,000 SHARES
 
PROSPECTUS
 
                                     LOGO
 
                                 COMMON STOCK
 
  The 1,000,000 shares of common stock ("Common Stock") offered hereby (the
"Offering") are being sold by Lindberg Corporation (the "Company").
 
  The Common Stock of the Company is quoted on the Nasdaq National Market
under the symbol "LIND." On July 28, 1998, the closing price of the Common
Stock as reported on the Nasdaq National Market was $18.00 per share. See
"Price Range of the Common Stock; Dividend Policy."
 
  SEE "RISK FACTORS" BEGINNING ON PAGE 7 FOR A DISCUSSION OF 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 SECURI-
  TIES  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>
              PRICE TO     UNDERWRITING   PROCEEDS TO
               PUBLIC        DISCOUNT    COMPANY(1)(2)
- ------------------------------------------------------
<S>        <C>            <C>            <C>
Per Share      $17.00         $1.00          $16.00
- ------------------------------------------------------
Total(3)    $17,000,000     $1,000,000    $16,000,000
- ------------------------------------------------------
</TABLE>
- -------------------------------------------------------------------------------
(1) The Company has agreed to indemnify the Underwriters against certain
    liabilities, including liabilities under the Securities Act of 1933, as
    amended. See "Underwriting."
(2) Before deducting expenses payable by the Company, estimated at $300,000.
(3) The Company has granted the Underwriters a 30-day option to purchase up to
    an additional 150,000 shares at the Price to Public less the Underwriting
    Discount solely to cover over-allotments, if any. If such option is
    exercised in full, the total Price to Public, Underwriting Discount and
    Proceeds to Company will be $19,550,000, $1,150,000 and $18,400,000,
    respectively. See "Underwriting."
 
                               ----------------
 
  The shares of Common Stock are offered severally by the Underwriters
specified herein, subject to receipt and acceptance by them and subject to
their right to reject any order, in whole or in part. It is expected that
delivery of the certificates representing the shares will be made against
payment therefor in Chicago, Illinois, on or about August 3, 1998.
 
ABN AMRO INCORPORATED                                         MCDONALD & COMPANY
                                                               SECURITIES, INC.
 
                                 July 28, 1998
<PAGE>
 
                                    [logo]
 
 
   [Map of the Company's facilities in the United States and photographs of
                     selected operations of the Company.]
 
 
  CERTAIN PERSONS PARTICIPATING IN THIS 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
SECURITIES, AND THE IMPOSITION OF A PENALTY BID. IN ADDITION, CERTAIN
UNDERWRITERS (AND SELLING GROUP MEMBERS, IF ANY) ALSO MAY ENGAGE IN PASSIVE
MARKET MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET,
IN ACCORDANCE WITH RULE 103 OF THE SECURITIES EXCHANGE ACT OF 1934. FOR A
DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                                       2
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary should be read in conjunction with, and is qualified in
its entirety by, the more detailed information and consolidated financial
statements, including the related notes thereto, appearing elsewhere or
incorporated by reference in this Prospectus. Unless otherwise indicated, all
information in this Prospectus assumes that the Underwriters' over-allotment
option will not be exercised. References in this Prospectus to the "Company" or
"Lindberg" are to Lindberg Corporation and its consolidated subsidiaries unless
the context indicates otherwise. Unless otherwise indicated, all financial
information refers to results from continuing operations.
 
                                  THE COMPANY
 
OVERVIEW
 
  Lindberg is the largest commercial heat treating company in the United
States, with operations in major industrial centers throughout the country. The
Company serves more than 9,000 customers in diverse industries, including
commercial aerospace, automotive/light truck, off-road vehicle, oilfield
equipment, defense, consumer products, tool and die, agriproducts and a variety
of other industries. Through both internal growth and acquisitions, the Company
currently operates 25 heat treating plants, and four heat treating facilities
located on the premises of customers, in 14 states. These 29 facilities are
grouped into 20 divisions.
 
  Lindberg provides a wide range of heat treating processes, in which ferrous,
aluminum and other specialty metals are exposed to precise temperatures and
other conditions to improve mechanical properties, durability and wear
resistance. The Company provides these services to larger industrial
manufacturers with high volumes and a variety of products as well as small,
specialized manufacturers. Typical products that the Company heat treats are
aircraft components, automotive parts, machine tools and dies, oilfield drill
rig parts, consumer products and a variety of other metal products.
 
  The Company has established itself as a leading commercial heat treater based
on its key competitive strengths, including its high level of quality and
service, technical expertise, network of facilities, industry certifications
and national reputation. The Company delivers high quality service on a timely
basis, while its technical expertise provides the capability to develop
customized solutions that meet specific customer needs. Many of the Company's
facilities are strategically located in major industrial centers in the
Midwest, California, Texas and the Northeast. This network allows the Company
to offer a wide range of services within close proximity to its customers. The
Company also offers dedicated heat treating services to certain larger
customers under long-term contracts through its Strategic Partnership 2000 ("SP
2000") program. This program was developed to (i) provide services to
manufacturers that perform their own heat treating in-house, (ii) retain
existing customers whose high heat treating volume may justify moving the
process in-house and (iii) capture additional volume from customers that may be
using multiple heat treaters.
 
  The Company's net sales increased from $59.4 million in 1994 to $88.8 million
in 1997 and, over the same period, operating earnings increased from $4.9
million to $13.3 million and diluted earnings per share from continuing
operations increased from $.51 per share to $1.41 per share. Net sales
increased from $20.6 million in the first quarter of 1997 to $30.9 million in
the first quarter of 1998 and, over the same period, operating earnings
increased from $2.6 million to $4.9 million and diluted earnings per share from
continuing operations increased from $.27 per share to $.48 per share.
 
INDUSTRY
 
  Heat treating is performed either in-house in captive departments of
manufacturers or externally by a commercial heat treating company such as
Lindberg. Commercial heat treaters are independent companies that specialize in
heat treating or other metal treatments and serve a large number of customers
across a variety of industries. The U.S. Department of Commerce reported sales
by commercial heat treating companies of
 
                                       3
<PAGE>
 
approximately $2 billion in 1996. Management believes that this $2 billion
represents about 10% of the annual heat treating performed in the U.S., with
the balance performed in captive heat treating departments. Commercial heat
treating sales, as compiled by the Metal Treating Institute, an industry
association, have grown at a compound annual rate of approximately 8% to 9%
from 1993 through 1997.
 
  Due to the time and costs associated with transporting materials and
customers' need for quick turnaround of heat treated products, commercial heat
treating has developed as a regional industry, with customers typically located
within 100 to 200 miles of the heat treating supplier. Consequently, the
commercial heat treating industry is highly fragmented and presents
opportunities for consolidation. Smaller heat treaters have been motivated to
combine with larger companies due to increasing regulatory and certification
requirements, ongoing capital expenditures necessary to remain competitive and
increasing demand for technical expertise. In addition, a number of industry
participants have acquired heat treaters in order to expand their geographical
presence and provide expanded or enhanced service capabilities.
 
BUSINESS STRATEGY
 
  Management believes that the market environment has created opportunities for
the Company to strengthen its market position and enhance profitability by
meeting its customers' service requirements of quality, cost and on-time
delivery. To that end, the Company pursues an internal operating strategy and
an active acquisition strategy.
 
 OPERATING STRATEGY
 
  The operating strategy involves a combination of the following: (i) focusing
on service and quality designed to improve customer satisfaction and retention;
(ii) providing customers with a high degree of technical expertise and in depth
industry knowledge; (iii) emphasizing process improvements and equipment
utilization to increase productivity; (iv) operating on a decentralized basis
so that each division can react quickly and effectively to local market
conditions; (v) emphasizing employee ("associate") training and involvement in
all phases of the Company's operations; and (vi) attracting and retaining large
volume customers through a program that offers customers dedicated heat
treating services.
 
 ACQUISITION STRATEGY
 
  As industry consolidation continues, the Company expects acquisitions to be
an important part of its growth strategy. The Company is interested in
acquiring profitable, well run businesses that complement its heat treating
operations by increasing its existing market presence, providing an entry into
new regions or expanding its service offerings. By increasing the number of
facilities in a particular region, the Company can provide a more comprehensive
and higher level of service. Newly acquired companies in existing markets often
provide an opportunity for the Company to balance its production capacity
within a region. The Company also seeks to acquire businesses that are based in
markets in which Lindberg is not yet established, or that would expand the
Company's service offerings, such as coatings, forming or other ancillary
services. The Company seeks to improve operations of acquired businesses by
sharing established operating know-how, technology, technical expertise,
industry knowledge and financial resources and by leveraging Lindberg's
national reputation.
 
DIVESTITURE OF PRECISION PRODUCTS
 
  In the fourth quarter of 1997, the Company established a plan to divest
itself of its Precision Products business segment. This segment consisted of
two aluminum die casting facilities (Impact Industries, Inc. and Arrow-Acme
Company) and one aluminum semi-permanent mold foundry (Harris Metals). The
Company reclassified its consolidated financial statements for 1997 and prior
periods to report that segment as discontinued operations. At December 31,
1997, net assets (less the allowance for an estimated after-tax loss of $5.9
million)
 
                                       4
<PAGE>
 
of the discontinued operations totaled $17.5 million. The Company believes that
the divestiture will enable the Company to focus on its core competency and to
pursue growth opportunities in heat treating or ancillary services.
 
  In April 1998, the Company sold substantially all of the operating assets of
Impact Industries, Inc. and in June 1998, the Company completed the sale of the
assets of Harris Metals. The Company expects the divestiture of the Precision
Products business segment to be completed by the end of 1998.
 
RECENT DEVELOPMENT
 
  On July 20, 1998, the Company reported net sales for the quarter ended June
30, 1998 of $33.0 million, up 59% from $20.8 million for the second quarter of
1997. Approximately 85% of the year-to-year increase in net sales resulted from
acquisitions in 1997 and 1998. Excluding acquisitions, the Company's remaining
operations reported increased net sales of 9% overall. The Company's gross
margin in the second quarter of 1998 improved to 31.4% from 27.8% in the second
quarter of 1997. Net earnings from continuing operations in the second quarter
of 1998 were $2.7 million, or $.52 per diluted share, an increase of 47% from
$1.8 million, or $.37 per diluted share, for the corresponding period in 1997.
 
  Net sales for the six months ended June 30, 1998 increased to $63.9 million
from $41.4 million for the first six months of 1997. Net earnings from
continuing operations for the first six months of 1998 were $5.1 million, or
$1.01 per diluted share, an increase of 64% from $3.1 million, or $.64 per
diluted share, for the first six months of 1997.
 
                                ----------------
 
  The principal executive offices of the Company are located at 6133 North
River Road, Suite 700, Rosemont, Illinois 60018, telephone: 847-823-2021.
 
                                  THE OFFERING
 
<TABLE>   
<S>                                   <C>
Common Stock offered by the Company.. 1,000,000 shares
Common Stock to be outstanding after
 the                                  5,866,581 shares (6,016,581 shares if the
 Offering (1)........................ Underwriters exercise the over-allotment
                                      option in full)
Use of Proceeds...................... To reduce bank debt
Nasdaq National Market symbol........ LIND
</TABLE>    
- --------
(1) Based on 4,866,581 shares issued and outstanding as of May 31, 1998. Does
    not include 704,075 shares reserved for issuance upon exercise of
    outstanding stock options and stock options which may be granted under the
    Company's stock option plans. As of May 31, 1998, options to purchase
    435,850 shares were outstanding, of which options for 216,875 shares were
    exercisable on that date.
 
                                       5
<PAGE>
 
 
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
 
  Set forth below is summary historical consolidated financial information and
certain adjusted financial information of the Company. The consolidated
financial information as of and for the five years ended December 31, 1997 set
forth below has been derived from consolidated financial statements audited by
Arthur Andersen LLP, independent public accountants. The consolidated financial
data as of and for the three months ended March 31, 1998 and 1997 has been
derived from unaudited condensed consolidated financial statements which, in
the opinion of management, reflect all adjustments (consisting only of normal
recurring accruals) necessary for a fair presentation of the financial data for
such periods. The following information should be read in conjunction with
"Management's Discussion and Analysis of Results of Operations and Financial
Condition" and the Company's consolidated financial statements and the
accompanying notes appearing elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                          THREE MONTHS
                         ENDED MARCH 31,         YEARS ENDED DECEMBER 31,
                         ---------------  -------------------------------------------
                          1998    1997     1997        1996    1995    1994    1993
                         ------- -------  -------     ------- ------- ------- -------
                             (IN THOUSANDS, EXCEPT PER SHARE AND PLANT DATA)
<S>                      <C>     <C>      <C>         <C>     <C>     <C>     <C>
STATEMENT OF EARNINGS
 DATA:
 Net Sales.............. $30,872 $20,646  $88,784     $72,776 $67,967 $59,380 $55,609
 Gross Profit...........   9,600   5,472   25,092      20,257  19,265  15,028  12,905
 Operating Earnings
  (Loss)................   4,876   2,574   13,317       9,643   8,036   4,865  (5,742)(1)
 Earnings (Loss) from
  Continuing Operations
  Before Income Taxes...   4,100   2,203   11,636       8,131   7,013   4,076  (6,073)
 Earnings (Loss) from
  Continuing Operations.   2,440   1,311    6,961       4,838   4,173   2,443  (3,766)
 Earnings (Loss) from
  Discontinued
  Operations, Net of
  Income Taxes..........     --     (206)  (6,698)(2)     178   1,462   1,931     948
 Net Earnings (Loss)....   2,440   1,105      263       5,016   5,635   4,374  (1,318)(3)
DILUTED EARNINGS PER
 SHARE(4):
 Earnings (Loss) from
  Continuing Operations. $   .48 $   .27  $  1.41     $   .99 $   .88 $   .51 $  (.48)
 Earnings (Loss) from
  Discontinued
  Operations............     --     (.04)   (1.36)        .04     .30     .41     .20
 Net Earnings (Loss)....     .48     .23      .05        1.03    1.18     .92    (.28)
 Weighted Average Shares
  Outstanding and
  Equivalents...........   5,042   4,869    4,933       4,861   4,763   4,758   4,710
OTHER INFORMATION:
 Capital Expenditures... $ 2,316 $ 1,154  $ 7,336     $ 5,365 $ 4,029 $ 4,396 $ 2,565
 Depreciation and
  Amortization..........   1,471     951    4,204       3,695   3,459   3,258   3,457
 Number of Plants at
  Period-End............      28      21       26          22      21      19      19
STATEMENT OF EARNINGS
 DATA, AS
 ADJUSTED(5)(6):
 Earnings from
  Continuing Operations. $ 2,596 $ 1,467  $ 7,560
 Diluted Earnings per
  Share from Continuing
  Operations............     .43     .25     1.27
</TABLE>
 
<TABLE>
<CAPTION>
                                                            AT MARCH 31, 1998
                                                         -----------------------
                                                          ACTUAL  AS ADJUSTED(5)
                                                         -------- --------------
                                                             (IN THOUSANDS)
<S>                                                      <C>      <C>
BALANCE SHEET DATA:
 Working Capital........................................ $ 18,385    $ 18,385
 Total Assets...........................................  102,764     102,764
 Total Debt.............................................   44,526      28,826
 Total Stockholders' Equity.............................   34,254      49,954
</TABLE>
- --------
(1) Includes a provision of $8,261,000 ($5,122,000 after-tax) for the
    restructuring of the Company's heat treating operations.
(2) Includes a net charge of $5,944,000 related to the discontinuance of the
    Company's Precision Products segment.
(3) Includes a gain of $1,500,000 representing the cumulative effect of
    adopting SFAS 109, "Accounting for Income Taxes."
(4) Earnings per share have been restated to comply with SFAS No. 128,
    "Earnings Per Share."
(5) Adjusted to give effect to the Offering at the public offering price of
    $17.00 per share and after deducting the underwriting discount and
    estimated offering expenses, and the application of the net proceeds of the
    Offering to repay indebtedness which was outstanding during the periods
    presented for the Statement of Earnings data and as of March 31, 1998 for
    the Balance Sheet data. The adjusted financial information is not
    necessarily indicative of the future results of operations and financial
    position of the Company or the results of operations and financial position
    that would have actually occurred had the Offering been in effect for the
    periods or as of the date presented.
(6) Historical and As Adjusted Basic Earnings per Share from Continuing
    Operations were $.50, $.27 and $1.45, and $.44, $.25 and $1.30,
    respectively, for the three months ended March 31, 1998 and 1997 and the
    year ended December 31, 1997.
 
                                       6
<PAGE>
 
                STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS
 
  Statements in this Prospectus or in documents incorporated herein by
reference that are not statements of historical fact constitute "forward-
looking statements" within the meaning of the Private Securities Litigation
Reform Act of 1995, including statements regarding future revenues, expenses
and profits. These forward-looking statements are subject to known and unknown
risks, uncertainties or other factors which may cause the actual results of
the Company to be materially different from the historical results or from any
results expressed or implied by the forward-looking statements. Such risks and
factors include, but are not limited to, those discussed below under "Risk
Factors" and "Management's Discussion and Analysis of Results of Operations
and Financial Condition." All cautionary statements made in this Prospectus
should be read as being applicable to all related forward-looking statements
wherever they appear.
 
                                 RISK FACTORS
 
  An investment in the Common Stock involves certain risks. Prospective
investors should consider carefully the following risk factors, in addition to
the other information set forth in this Prospectus or incorporated herein by
reference, before purchasing the Common Stock.
 
ECONOMY; INDUSTRY CONCENTRATION
 
  The Company provides services to customers operating across a wide range of
manufacturing industries, and its financial results have historically followed
general economic conditions in the United States. The Company has benefited
from the strong U.S. economy in recent years. However, a prolonged
retrenchment in the general U.S. economy could have a material adverse effect
on the Company's operating results and, ultimately, financial condition. In
addition, due to the high fixed cost structure of the heat treating business,
a reduction in the Company's sales volume can have a disproportionately
adverse effect on its profitability.
 
  The Company estimates that customers serving the aerospace and automotive
industries currently account for approximately 30% to 35% and 15% to 20%,
respectively, of the Company's net sales. See "Business--Customers." A
significant decline in either commercial aircraft or automobile production
could have a material adverse effect on the Company's business and financial
condition, if the Company were unable to replace such business with orders
from other industries. The Company's concentration in certain industries may
change depending on the Company's acquisitions and the condition of the
industries served by the Company.
 
RISKS ASSOCIATED WITH ACQUISITION STRATEGY
 
  The Company's growth strategy includes acquisitions of heat treating
businesses that complement its current operations. Although the Company
believes that there are many suitable acquisition candidates, it may not be
able to capitalize on certain opportunities due to potential sellers'
valuations and competition from other prospective buyers. The Company's
acquisition activities may involve certain other risks, including potential
disruption to the Company's ongoing business, integration difficulties,
difficulty implementing uniform standards, controls, procedures and policies,
potential impairment of relationships with employees and customers, and
potential liabilities of an acquired company. Future acquisitions may be
financed by internally generated funds, bank borrowings, or public offerings
or private placements of equity or debt securities, to the extent such
financing opportunities are available to the Company. Any acquisitions funded
by equity of the Company may be dilutive.
 
APPROVED VENDOR STATUS
 
  Many of the Company's customers are contractors or subcontractors to major
manufacturers that impose stringent quality standards and that require their
contractors and subcontractors to use only approved vendors. The Company is an
approved vendor for these major manufacturers and, as an approved vendor, it
is subject to
 
                                       7
<PAGE>
 
periodic audit and renewal of certifications. Should the Company lose its
status as an approved vendor for one or more major manufacturers, the Company
may suffer a loss in revenues and may incur additional costs in connection
with seeking recertification.
 
ENVIRONMENTAL REGULATIONS
 
  The Company is subject to federal, state and local environmental laws and
regulations concerning emissions into the air, discharges into waterways and
the generation, handling and disposal of waste materials. The Company's past
expenditures relating to environmental compliance have not had a material
adverse effect on the Company. However, there can be no assurance that changes
in these laws and regulations or in their enforcement, or the discovery of new
environmental issues requiring corrective measures in the future, will not
adversely affect the Company's capital expenditures, earnings and competitive
position. See "Business--Environmental Regulation."
 
PRODUCT AND OTHER LIABILITIES
 
  The Company's business may expose it to potential product liability claims
in the event that a failure of a product containing parts treated by the
Company results in personal injury or death. In addition, if any product with
parts treated by the Company proves to be defective, the Company may be
required to participate in a recall involving such product. Although the
Company maintains various types of insurance coverage, there can be no
assurance that such coverage will be adequate for liabilities that may be
incurred or that it will continue to be available on terms acceptable to the
Company.
 
  The Company believes that it is in material compliance with applicable laws
and regulations relating to occupational hazards and safety. However, the
Company's operations entail risk of injury to production workers. There can be
no assurance that the Company will not incur material costs and liabilities in
connection with personal injuries suffered by its associates.
 
RISKS ASSOCIATED WITH GOVERNMENT PROGRAMS
 
  The Company estimates that approximately 5% to 10% of the Company's net
sales are generated from government contractors and subcontractors whose
products are used by the defense industry. As a service provider to
contractors and subcontractors of the U.S. government, the Company is directly
and indirectly subject to various federal rules, regulations and orders
applicable to government contracts. Although the Company believes that it is
in material compliance with all such laws, any future violation could result
in civil liability, cancellation or suspension of existing contracts or
ineligibility for future contracts funded in whole or in part with federal
funds. Future changes in these rules, regulations and orders may make
compliance substantially more costly. In addition, a significant reduction in
defense budgets in the future may adversely affect the Company's volume and
margins.
 
  The Company is the subject of a pending investigation by the government and
a qui tam (whistle-blower) lawsuit regarding alleged violations of the Federal
False Claims Act. Although the activities that are the subject of the
investigation and lawsuit appear to relate to only one plant, no assurance can
be given that the investigation or lawsuit will not materially adversely
affect the Company. See "Business--Litigation."
 
COMPETITION
 
  Competition in the heat treating industry is intense. Companies generally
compete on a local level for customers in a defined geographic area on the
basis of timely delivery, quality and price. In certain markets, the Company
competes against companies that may have larger facilities and greater
resources in those markets.
 
 
                                       8
<PAGE>
 
DEPENDENCE UPON KEY PERSONNEL
 
  The Company's continued success will depend to a large extent upon the
abilities and continued efforts of its senior management and upon the
Company's ability to attract and retain highly qualified personnel, including
personnel associated with businesses acquired by the Company. The loss of key
members of the Company's management team could adversely affect the Company's
results of operations and future growth prospects.
 
VOLATILITY OF STOCK PRICE; LIMITED PUBLIC FLOAT
 
  The market price of the Common Stock is affected by a number of factors,
including limited trading volume, variations in the Company's operating
results, evolving business prospects and competitors, as well as general
conditions in the economy and the financial markets. Also, the equity markets
generally have experienced significant price and volume fluctuations in recent
years. This volatility can impact significantly the stock price of many
companies for reasons unrelated to their performance.
 
  Although a public market exists for the Common Stock, trading activity has
been limited. Due to the relatively small number of shares currently
outstanding, the trading of a relatively small number of shares could subject
the stock price to volatility and significantly affect the market price of the
Common Stock.
 
LIMITATIONS ON CHANGE IN CONTROL
 
  Certain provisions in the Company's Certificate of Incorporation and By-laws
may have the effect of delaying, deferring or preventing a change in control
of the Company, even if such a change would be beneficial to many
stockholders. These provisions include a staggered board and super-majority
stockholder vote or approval by a super-majority of the Board of Directors for
a change in the number of directors. In addition, the board of directors has
the authority, without further action by the stockholders, to issue up to one
million shares of preferred stock in one or more series and to fix the rights,
preferences, privileges and restrictions thereof, and to issue authorized but
unissued shares of Common Stock up to a maximum of 25 million shares. The
issuance of preferred stock or additional shares of Common Stock could have
the effect of delaying, deferring or preventing a change in control of the
Company, even if such change in control would be beneficial to the Company's
stockholders. The Company's stockholder rights plan may also have the effect
of discouraging a change in control of the Company, as could the elimination
of stockholder action by written consent without a meeting, as the Company's
charter provides. A two-thirds vote of the holders of the Company's voting
securities is required for certain mergers and other major corporate
transactions with holders of 10% or more of the Company's voting securities
without approval of the Company's Board of Directors prior to such 10%
ownership. Further, the Company has not opted out of the provision under
Delaware law that imposes certain restrictions on any business combination
between the Company and an "interested stockholder" as defined in the Delaware
statute. See "Description of Capital Stock--Anti-Takeover Effects of the
Company's Governing Documents and Delaware Corporate Law."
 
                                       9
<PAGE>
 
                                USE OF PROCEEDS
 
  The Company estimates the net cash proceeds from the Offering to be
approximately $15.7 million at the public offering price of $17.00 per share,
after paying the underwriting discount ($1.0 million) and the expenses of the
Offering (such as legal, accounting and printing costs, which the Company
estimates to be approximately $300,000). If the Underwriters exercise their
over-allotment option in full, the net cash proceeds are estimated to be
approximately $18.1 million.
 
  The Company intends to use all of the net proceeds to repay outstanding
indebtedness under its revolving credit facility (the "Revolving Credit
Facility"). The Revolving Credit Facility will expire in April 2000 and, at
May 31, 1998, the Company's borrowings totaled $28 million under the Revolving
Credit Facility. These borrowings had an effective interest rate of 6.6% per
annum in 1997 and 6.7% per annum in the first quarter of 1998. Of the
outstanding revolving credit borrowings, approximately $20 million were
incurred in the twelve months ended May 31, 1998. This primarily reflected the
use of funds for acquisitions and capital expenditures, offset to some degree
by funds generated by operations and proceeds from the sale of Impact
Industries, Inc. See "Management's Discussion and Analysis of Results of
Operations and Financial Condition--Liquidity and Capital Resources."
 
                                      10
<PAGE>
 
                       PRICE RANGE OF THE COMMON STOCK;
                                DIVIDEND POLICY
 
  The Common Stock is quoted on the Nasdaq National Market under the symbol
"LIND." The table below shows the range of high and low sales prices of the
Common Stock, as reported by the Nasdaq National Market, for the periods
indicated.
 
<TABLE>
<CAPTION>
                                                                 HIGH     LOW
                                                                ------- --------
      <S>                                                       <C>     <C>
      1996:
        First quarter.......................................... $10 1/4 $ 6 3/8
        Second quarter.........................................  11       8 1/4
        Third quarter..........................................  11 1/8   8 3/4
        Fourth quarter.........................................  11       9 1/4
      1997:
        First quarter..........................................  10       8 1/2
        Second quarter.........................................   9 1/4   8 1/2
        Third quarter..........................................  12 1/2   8 7/8
        Fourth quarter.........................................  16      11 3/4
      1998:
        First quarter..........................................  18 1/8  12 3/4
        Second quarter.........................................  25      16 3/4
        Third quarter (through July 28, 1998)..................  20 1/4  17 9/16
</TABLE>
 
  On July 28, 1998, the closing price of the Common Stock was $18.00 per
share, and there were approximately 450 stockholders of record on that date.
 
  The Company has paid quarterly cash dividends on the Common Stock on a
regular basis since 1959. The Company paid quarterly cash dividends of $.07
per share in the first three quarters of 1996. Commencing in the fourth
quarter of 1996, the quarterly cash dividend was increased to $.08 per share.
In determining whether to declare a cash dividend, the Board of Directors will
consider the Company's earnings, consolidated financial condition and results
of operations, taxes, legal restrictions, general economic conditions and
other factors. The Company intends to continue to pay regular quarterly cash
dividends on its Common Stock, subject to the Company's need for those funds
and compliance with financial covenants under the Company's financing
arrangements.
 
  The Company's Note Agreement for its $10,000,000 Principal Amount 7.16%
Senior Notes due October 30, 2002 contains restrictions on the declaration or
payment by the Company of cash dividends or other distributions in respect of
its capital stock unless certain financial requirements are met. At March 31,
1998, approximately $5.0 million was not so restricted, which amount would be
increased by approximately $15.7 million upon completion of this Offering.
 
                                      11
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth the consolidated short-term debt and
capitalization of the Company at March 31, 1998, and as adjusted to reflect
the sale of the Common Stock offered hereby by the Company and the application
of the net proceeds from such sale. This table should be read in conjunction
with the Company's consolidated financial statements and the related notes and
other financial information included in this Prospectus or incorporated herein
by reference.
 
<TABLE>
<CAPTION>
                                                            MARCH 31, 1998
                                                        -----------------------
                                                        ACTUAL   AS ADJUSTED(1)
                                                        -------  --------------
                                                            (IN THOUSANDS)
<S>                                                     <C>      <C>
Short-Term Debt, including Current Maturities of Long-
 Term Debt............................................. $ 8,463     $ 8,463
Long-Term Debt (Less Current Maturities)...............  36,063      20,363
                                                        -------     -------
    Total Debt.........................................  44,526      28,826
Stockholders' Equity:
  Common Shares, $2.50 par value:
    Authorized 12,000,000 shares;
    Issued 5,673,397 shares(2).........................  14,183          67 (3)
  Additional Paid-In Capital...........................   1,529      31,345 (3)
  Retained Earnings....................................  23,431      23,431
  Treasury Shares (826,216 shares) at cost.............  (4,735)     (4,735)
  Underfunded Pension Liability Adjustment.............    (154)       (154)
                                                        -------     -------
    Total Stockholders' Equity.........................  34,254      49,954
                                                        -------     -------
Total Capitalization................................... $78,780     $78,780
                                                        =======     =======
</TABLE>
- --------
(1) As adjusted to reflect (i) the sale of 1,000,000 shares of Common Stock in
    the Offering at the public offering price of $17.00 per share, net of the
    underwriting discount and estimated expenses, and (ii) the application of
    all of the anticipated net proceeds from the Offering to reduce certain
    bank indebtedness of the Company. See "Use of Proceeds."
(2) Excludes 704,075 shares reserved for issuance upon exercise of outstanding
    stock options and stock options which may be granted under the Company's
    stock option plans. At May 31, 1998, options to purchase 435,850 shares
    were outstanding, of which options for 216,875 shares were exercisable on
    that date.
(3) As adjusted to reflect the amendment to the Company's Certificate of
    Incorporation effective April 24, 1998, pursuant to which the par value of
    the Common Stock has been changed to $.01 per share, the number of
    authorized shares of Common Stock was increased to 25,000,000 and a new
    class of 1,000,000 shares of preferred stock, issuable in series, was
    authorized.
 
                                      12
<PAGE>
 
                     SELECTED CONSOLIDATED FINANCIAL DATA
 
  Set forth below is selected historical consolidated financial information
and certain adjusted financial information of the Company. The consolidated
financial information as of and for the five years ended December 31, 1997 set
forth below has been derived from consolidated financial statements audited by
Arthur Andersen LLP, independent public accountants. The consolidated
financial data as of and for the three months ended March 31, 1998 and 1997
has been derived from unaudited condensed consolidated financial statements
which, in the opinion of management, reflect all adjustments (consisting only
of normal recurring accruals) necessary for a fair presentation of the
financial data for such periods. The following information should be read in
conjunction with "Management's Discussion and Analysis of Results of
Operations and Financial Condition" and the Company's consolidated financial
statements and the accompanying notes appearing elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                           THREE MONTHS
                          ENDED MARCH 31,              YEARS ENDED DECEMBER 31,
                         ------------------  ---------------------------------------------------
                           1998      1997      1997         1996      1995      1994      1993
                         --------  --------  --------     --------  --------  --------  --------
                                (IN THOUSANDS, EXCEPT PER SHARE AND PLANT DATA)
<S>                      <C>       <C>       <C>          <C>       <C>       <C>       <C>
STATEMENT OF EARNINGS
 DATA:
 Net Sales.............. $ 30,872  $ 20,646  $ 88,784     $ 72,776  $ 67,967  $ 59,380  $ 55,609
 Cost of Sales..........  (21,272)  (15,174)  (63,692)     (52,519)  (48,702)  (44,352)  (42,704)
                         --------  --------  --------     --------  --------  --------  --------
 Gross Profit...........    9,600     5,472    25,092       20,257    19,265    15,028    12,905
 Selling and
  Administrative
  Expenses..............   (4,724)   (3,154)  (13,211)     (11,507)  (11,530)  (10,217)  (10,386)
 Equity in Earnings of
  Partnership...........      --        256     1,436          893       301        54       --
 Restructuring Charge...      --        --        --           --        --        --     (8,261)
                         --------  --------  --------     --------  --------  --------  --------
 Operating Earnings
  (Loss)................    4,876     2,574    13,317        9,643     8,036     4,865    (5,742)
 Interest Expense (Net).     (776)     (371)   (1,681)      (1,512)   (1,638)     (789)     (331)
 Gain on Asset
  Conversion............      --        --        --           --        615       --        --
                         --------  --------  --------     --------  --------  --------  --------
 Earnings (Loss) from
  Continuing Operations
  Before Income Taxes...    4,100     2,203    11,636        8,131     7,013     4,076    (6,073)
 Provision (Benefit) for
  Income Taxes--
  Continuing Operations.    1,660       892     4,675        3,293     2,840     1,633    (2,307)
                         --------  --------  --------     --------  --------  --------  --------
 Earnings (Loss) from
  Continuing Operations.    2,440     1,311     6,961        4,838     4,173     2,443    (3,766)
 Earnings (Loss) from
  Discontinued
  Operations, Net of
  Income Taxes..........      --       (206)   (6,698)(1)      178     1,462     1,931       948
                         --------  --------  --------     --------  --------  --------  --------
 Net Earnings (Loss).... $  2,440  $  1,105  $    263     $  5,016  $  5,635  $  4,374  $ (1,318)(2)
DILUTED EARNINGS PER
 SHARE(3):
 Earnings (Loss) from
  Continuing Operations. $    .48  $    .27  $   1.41     $    .99  $    .88  $    .51  $   (.48)
 Earnings (Loss) from
  Discontinued
  Operations............      --       (.04)    (1.36)         .04       .30       .41       .20
 Net Earnings (Loss)....      .48       .23       .05         1.03      1.18       .92      (.28)
 Weighted Average Shares
  Outstanding and
  Equivalents...........    5,042     4,869     4,933        4,861     4,763     4,758     4,710
BALANCE SHEET DATA:
 Working Capital........ $ 18,385  $ 31,322  $ 16,147     $ 30,100  $ 29,237  $ 23,726  $  8,616
 Total Assets...........  102,764    74,638    89,563       74,888    68,639    65,878    48,223
 Total Debt.............   44,526    21,901    36,166       21,601    18,900    17,900     7,780
 Total Stockholders'
  Equity................   34,254    33,935    32,091       33,047    29,182    24,669    21,155
OTHER INFORMATION:
 Capital Expenditures... $  2,316  $  1,154  $  7,336     $  5,365  $  4,029  $  4,396  $  2,565
 Depreciation and
  Amortization..........    1,471       951     4,204        3,695     3,459     3,258     3,457
 Number of Plants at
  Period-End............       28        21        26           22        21        19        19
STATEMENT OF EARNINGS
 DATA, AS
 ADJUSTED(4)(5):
 Earnings from
  Continuing Operations. $  2,596  $  1,467  $  7,560
 Diluted Earnings per
  Share from Continuing
  Operations............      .43       .25      1.27
</TABLE>
- --------
(1) Includes a net charge of $5,944,000 related to the discontinuance of the
    Company's Precision Products segment.
(2) Includes gain of $1,500,000 representing the cumulative effect of adopting
    SFAS 109, "Accounting for Income Taxes."
(3) Earnings per share have been restated to comply with SFAS No. 128,
    "Earnings Per Share."
(4) Adjusted to give effect to the Offering at the public offering price of
    $17.00 per share and after deducting the underwriting discount and
    estimated offering expenses, and the application of the net proceeds of
    the Offering to repay indebtedness which was outstanding during the
    periods presented. The adjusted financial information is not necessarily
    indicative of the future results of operations and financial position of
    the Company or the results of operations and financial position that would
    have actually occurred had the Offering been in effect for the periods or
    as of the date presented.
(5) Historical and As Adjusted Basic Earnings per Share from Continuing
    Operations were $.50, $.27 and $1.45, and $.44, $.25 and $1.30,
    respectively, for the three months ended March 31, 1998 and 1997 and the
    year ended December 31, 1997.
 
                                      13
<PAGE>
 
                     MANAGEMENT'S DISCUSSION AND ANALYSIS
               OF RESULTS OF OPERATIONS AND FINANCIAL CONDITION
 
OVERVIEW
 
  The Company was founded in 1922 and, through internal growth and external
acquisitions, has become the largest provider of commercial heat treating in
the nation, operating 29 facilities located across the country. Over the past
year, management has repositioned the Company in order to take advantage of
the growth opportunities in its core heat treating operations. With the
planned divestiture of the Precision Products segment discussed below, the
Company's operating, managerial and financial resources are focused on
enhancing the performance of existing heat treating operations and expanding
the Company's presence through strategic acquisitions in existing and new
markets.
 
  In addition to expanding its business internally, the Company continues to
seek external growth by acquisitions of profitable, well-run companies that
will complement its existing heat treating operations. Since 1994, the Company
has acquired seven heat treating businesses. In 1997, the Company acquired
Ticorm, Inc. and purchased the 50% interest in Alumatherm Heat Treating
Company not already owned by the Company. Ticorm and Alumatherm are Los
Angeles-based heat treating businesses that serve primarily the commercial
aerospace industry. In 1998, the Company acquired Industrial Steel Treating
Co. and Fabriform Metal Brazing Inc., two related facilities in the Los
Angeles area that also serve principally the commercial aerospace industry.
Also in 1998, the Company acquired Houston Heat Treating Company, a Houston-
based heat treating business that serves the oilfield equipment industry. The
Company has identified a number of other acquisition candidates and will
continue to evaluate these and other opportunities.
 
  In the fourth quarter of 1997, the Company established a plan to divest its
Precision Products business segment and sell the underlying facilities so that
the Company could focus its resources on its higher margin, core heat treating
business. At year-end 1997, the Company reported the Precision Products
business as discontinued operations and recorded an after-tax charge of $5.9
million related to the estimated loss on the sale of the three facilities in
this segment. The Company completed the sale of certain assets of two of the
Precision Products facilities, Impact Industries, Inc. and Harris Metals, in
April and June 1998, respectively. The Company expects to complete the
divestiture of the Precision Products business segment by year-end 1998 and to
use the proceeds to repay borrowings and to fund continued expansion of its
heat treating operations, including acquisitions.
 
RESULTS OF OPERATIONS
 
  The following table presents certain statement of earnings data expressed as
a percentage of net sales for the periods presented.
 
<TABLE>
<CAPTION>
                                                 THREE
                                                MONTHS
                                                 ENDED         YEARS ENDED
                                               MARCH 31,      DECEMBER 31,
                                              ------------  -------------------
                                              1998   1997   1997   1996   1995
                                              -----  -----  -----  -----  -----
   <S>                                        <C>    <C>    <C>    <C>    <C>
   Net Sales................................. 100.0% 100.0% 100.0% 100.0% 100.0%
   Gross Profit..............................  31.1   26.5   28.3   27.8   28.3
   Selling and Administrative Expenses.......  15.3   15.3   14.9   15.8   17.0
   Operating Earnings........................  15.8   12.5   15.0   13.2   11.8
   Interest Expense (Net)....................   2.5    1.8    1.9    2.1    2.4
   Earnings from Continuing Operations.......   7.9    6.3    7.8    6.6    6.1
</TABLE>
 
 First Quarter 1998 Compared to First Quarter 1997
 
  Net sales for the quarter ended March 31, 1998 were $30.9 million, up $10.2
million, or 50%, from $20.6 million for the corresponding period in 1997.
Approximately 81% of the year-to-year increase in net sales
 
                                      14
<PAGE>
 
resulted from acquisitions in 1997 and 1998. Excluding acquisitions, the
Company's remaining operations reported increased net sales of 9% overall.
Facilities serving aerospace markets experienced strong order rates in the
first quarter of 1998, making a significant contribution to the total net
sales increase.
 
  Gross profit for the first quarter of 1998 was $9.6 million, up $4.1
million, or 75%, from $5.5 million for the first quarter of 1997. The
Company's gross margin in the first quarter of 1998 was 31.1%, compared to
26.5% in the corresponding period of 1997. The improved margin resulted as
sales growth exceeded the increase in expenses due to the fixed nature of
certain of the Company's operating costs. The improved margin also reflects
the effect of recent acquisitions.
 
  Selling and administrative expenses for the first three months of 1998 were
$4.7 million, compared to $3.2 million in the first quarter of 1997. The
increase resulted largely from expenses associated with acquired companies.
Selling and administrative expenses as a percentage of net sales were 15.3%
for the first quarters of 1998 and 1997.
 
  Subsequent to the Company's acquisition of its partner's 50% interest in the
Alumatherm partnership, the Company stopped recording equity in earnings of
the partnership and, therefore, did not report any such earnings during the
first quarter of 1998. During the first quarter of 1997, the Company reported
equity in earnings of $256,000 from the Alumatherm partnership.
 
  Interest expense in the first three months of 1998 was $776,000, compared to
$371,000 in the first quarter of 1997. This resulted from the increased level
of borrowing for the Company's recent acquisitions. Borrowing rates were
largely unchanged at 6.7% per annum.
 
  Reflecting the above, net earnings from continuing operations in the first
quarter of 1998 were $2.4 million, up $1.1 million, or 86%, from $1.3 million
for the corresponding period in 1997. Net earnings from continuing operations
for the first quarter of 1998 were $.48 per diluted share, up $.21, or 78%,
from $.27 per diluted share for the first quarter of 1997.
 
  As required by Accounting Principles Board Opinion No. 30, results of
discontinued operations for the first quarter of 1998 were included in the
reserve for loss on discontinued operations provided for previously.
Discontinued operations reported a net loss of $206,000, or $.04 per diluted
share, in the first quarter of 1997. Therefore, the Company reported net
earnings of $1.1 million, or $.23 per share, for that period.
 
 1997 Compared to 1996
 
  Net sales in 1997 were $88.8 million, up $16.0 million, or 22%, from $72.8
million in 1996. The higher level of net sales resulted primarily from the
acquisition of three heat treating companies from May 1996 through October
1997, expansion of the SP 2000 program during 1997 and growth at certain heat
treating plants where customer demand was strong, in particular those serving
the commercial aerospace industry. The acquisition of Vac-Hyd in 1996, and of
Ticorm and Alumatherm in 1997, accounted for 48% of the increase in net sales
for 1997. Also in 1997, the Company expanded the number of SP 2000 sites in
operation to seven from six at the close of 1996. This program provided net
sales in 1997 of $6.2 million in comparison to $3.9 million in 1996, thereby
contributing to the overall increase in Company sales in 1997. Finally, while
not all of the Company's heat treating plants generated sales growth in 1997
as compared to the prior year, heat treating operations in existence at the
beginning of 1996 reported an overall 9% increase in net sales.
 
  Gross profit in 1997 was $25.1 million, up $4.8 million, 24%, from $20.3
million in 1996. The gross margin in 1997 was 28.3%, compared to 27.8% in the
prior year. The increase in gross margin was related primarily to the higher
level of net sales during 1997, providing incremental earnings in excess of
the prior year's rate of gross margin. The improved gross margin was also the
result of cost containment efforts.
 
  Selling and administrative expenses in 1997 were $13.2 million, compared to
$11.5 million in 1996. Selling and administrative expenses as a percentage of
net sales decreased to 14.9% in 1997 from 15.8% in 1996. The
 
                                      15
<PAGE>
 
increase in the level of expenses in 1997 over the prior year resulted
primarily from additional expenses of approximately $1.0 million incurred in
connection with the acquisitions of Ticorm and Alumatherm.
 
  During 1997, for the first nine months of the year prior to the Company's
acquisition of its partner's 50% interest in the joint venture, equity
earnings related to the Alumatherm partnership recorded by the Company totaled
$1.4 million. This compared to $893,000 recorded for the full year 1996.
 
  Interest expense in 1997 was $1.7 million, compared to $1.5 million in 1996.
The increase resulted from the increased level of borrowings due to
acquisitions. The average interest rate on borrowings in 1997 was 6.6%
compared to 6.7% for 1996.
 
  Reflecting the above items, net earnings from continuing operations in 1997
were $7.0 million, up $2.1 million, or 44%, from $4.8 million in 1996. Net
earnings from continuing operations in 1997 were $1.41 per diluted share, up
$.42, or 42%, from $.99 per diluted share in 1996.
 
  The results of the Company's Precision Products segment, net of income
taxes, are presented as discontinued operations. In 1997, an after-tax loss of
$754,000 from operations was recorded compared to $178,000 in earnings for
1996. The loss from operations in 1997 resulted largely from a sales decline
at the segment's Impact Industries plant. Also in 1997, the Company recorded a
$5.9 million after-tax charge related to an estimated loss on the eventual
sale of the segment's operations. The Company concluded to divest the
Precision Products businesses and concentrate financial and operating
resources on the higher margin core heat treating business, which had
represented approximately 70% of total Company net sales during 1997. Net
earnings for 1997 were $263,000, or $.05 per diluted share, as compared to
$5.0 million, or $1.03 per diluted share, in 1996.
 
 1996 Compared to 1995
 
  Net sales for 1996 were $72.8 million, up $4.8 million, or 7%, from $68.0
million in 1995. The acquisition of Vac-Hyd accounted for approximately 40%,
and new SP 2000 projects accounted for approximately 27%, of the increase in
net sales in 1996. Excluding acquisitions and new SP 2000 net sales, heat
treating operations in existence at the beginning of 1996 reported an overall
2% increase in net sales.
 
  Gross profit in 1996 was $20.3 million, up $1.0 million, or 5%, from $19.3
million in 1995. The Company's gross margin in 1996 was 27.8%, compared to
28.3% for the prior year. The decline in gross margin in 1996 resulted
primarily from higher employee related costs, which more than offset the
positive effect produced by the increase in net sales during 1996.
 
  Selling and administrative expenses in 1996 were $11.5 million, essentially
unchanged from the prior year. Selling and administrative expenses as a
percentage of net sales decreased to 15.8% in 1996 from 17.0% in 1995.
 
  In 1996, the Company recorded $893,000 in equity earnings related to its
ownership in the Alumatherm partnership, up $592,000, or 197%, from $301,000
in 1995. This increase resulted from the partnership's strong sales and
earnings growth primarily due to its participation in the improving commercial
aerospace industry.
 
  Interest expense in 1996 was $1.5 million, compared to $1.6 million in 1995.
This resulted from lower interest rates experienced during 1996, which more
than offset higher levels of borrowings which the Company maintained during
the year, in particular after the acquisition of Vac-Hyd in May 1996.
 
  Results in 1995 also included a $615,000 gain related to a fire at the
Company's facility in Solon, Ohio. The complete destruction of one major piece
of equipment and subsequent capitalization of a new furnace resulted in an
involuntary conversion gain reported as other income.
 
 
                                      16
<PAGE>
 
  Reflecting primarily the above factors, net earnings from continuing
operations in 1996 were $4.8 million, up $665,000, or 16%, from $4.2 million
in 1995. Net earnings from continuing operations in 1996 were $.99 per diluted
share, compared to $.88 per diluted share in 1995.
 
  The Company's discontinued Precision Products segment recorded after-tax
earnings of $178,000 in 1996, compared to $1.5 million in 1995. The reduced
level of earnings in 1996 resulted from lower net sales within the segment for
the year, principally at the Impact Industries operation. Net earnings for
1996 were $5.0 million, or $1.03 per diluted share, as compared to $5.6
million, or $1.18 per diluted share, in 1995.
 
LIQUIDITY AND CAPITAL RESOURCES
 
  At March 31, 1998, the Company's total debt was $44.5 million, an increase
of $8.4 million from $36.2 million outstanding at December 31, 1997. The
Company's total debt to capitalization ratio was 57% at the end of the first
quarter of 1998 compared to 53% at the end of 1997.
 
  The level of debt increased in the first quarter of 1998 primarily as a
result of the acquisition of Industrial Steel Treating Co. and Fabriform Metal
Brazing, Inc. for a purchase price, net of cash received, of $10.6 million.
This transaction was funded with additional borrowings under the Company's
Revolving Credit Facility. The cash effect of this purchase was offset to a
degree by cash generated from operations during the quarter, which was used to
repay debt.
 
  Capital expenditures for the first three months of 1998 were $2.3 million,
increased from $1.2 million in the corresponding period of 1997. The spending
in the first quarter of 1998 related primarily to the acquisition of
additional furnaces and equipment for expansion at certain facilities and for
equipment under the SP 2000 program.
 
  In 1997, the Company's borrowings increased by $14.6 million to $36.2
million at year-end from $21.6 million at December 31, 1996. The ratio of debt
to total capitalization was 53% at the close of 1997, as compared to 40% at
year-end 1996.
 
  The most significant factor in the year-to-year increase in borrowing was
the use of funds in 1997 for the acquisitions of Ticorm, Inc. for $3.8 million
and the remaining 50% share of the Company's joint venture partnership
Alumatherm from its partner for $12.8 million. The Company completed these
acquisitions using a combination of bank borrowings and notes payable. At
year-end 1997, the notes payable related to Ticorm in the amount of $1.9
million and Alumatherm in the amount of $6.3 million remained outstanding.
 
  Another significant use of funds in 1997 was for capital expenditures. The
Company spent a total of $7.3 million on capital projects during 1997, as
compared to $5.4 million in 1996. The figures for both 1997 and 1996 exclude
amounts related to the purchase price of acquisitions and amounts related to
discontinued operations. The Company made capital investments in 1997
primarily to accommodate new business opportunities and, to a lesser degree,
upgrade facilities and equipment. Spending related to the Company's SP 2000
program represented about 25% of the total capital spending. Approximately 19%
of 1996 capital spending was for SP 2000 projects. Also during 1997, the
Company made significant capital outlays for new furnace installations at
several of its heat treating facilities.
 
  Levels of working capital associated with accounts receivable and accounts
payable increased slightly at the end of the first quarter of 1998 compared to
year-end 1997 and increased at year-end 1997 from the prior year largely as a
result of additional requirements related to businesses acquired in 1997.
Since the Company's heat treating customers maintain ownership of products
shipped to the Company for processing, the business does not have a working
capital need related to inventories.
 
  During 1997, the Company made cash outlays related to environmental matters.
These outlays largely included costs for consulting/engineering, legal
support, and in certain cases, remediation. The Company believes
 
                                      17
<PAGE>
 
it will continue to make such expenditures in the future, but that such
spending will continue to have a limited effect on its financial condition and
liquidity.
 
  During the first quarter of 1998, the Company paid cash dividends of $.08
per share, or a total of $387,000, compared to cash dividends of $.08 per
share, or a total of $382,000, during in the first quarter of 1997. In 1997,
the Company paid cash dividends totaling $.32 per share, which amounted to a
total of $1.5 million paid to stockholders during the year. This represented
an increase of 12% from the $1.4 million in cash dividends paid in 1996.
 
  In February 1998, the Company amended its Revolving Credit Facility to
increase the total borrowing capacity under the facility from $35 million to
$45 million, extend the maturity date of the agreement relating to the
facility to April 2000 and adjust certain loan covenants. At March 31, 1998,
the Company had $17 million available capacity under the amended Revolving
Credit Facility.
 
  The Company believes that its borrowing capacity and funds generated from
operations will be sufficient to meet currently foreseen capital investment
and working capital needs in support of existing business both in 1998 and in
the longer term. Proceeds from this Offering will be used to repay borrowings
and to provide the Company with a sufficiently strong financial structure to
fund additional investment opportunities through borrowings in the future.
 
INFLATION
 
  Although the Company cannot accurately determine the exact effect of
inflation on its operations, it does not believe inflation had a material
effect during the past three years on sales or results of operations.
 
POSSIBLE EFFECTS OF YEAR 2000
 
  The Company is continuing its investigation of the possible effect of the
Year 2000 issue on its operating, accounting and other systems. Based on
preliminary reviews, the Company believes that its internal systems and those
supplied it by third parties are or will be Year 2000 compliant without any
material additional expense. However, there can be no assurance that the
Company's operations will not be adversely affected by this issue,
particularly as it relates to compliance by the Company's customers and
suppliers.
 
                                      18
<PAGE>
 
                                   BUSINESS
 
GENERAL
 
  Lindberg is the largest commercial heat treating company in the United
States, with operations in major industrial centers throughout the country.
The Company serves more than 9,000 customers in diverse industries, including
commercial aerospace, automotive/light truck, off-road vehicle, oilfield
equipment, defense, consumer products, tool and die, agriproducts and a
variety of other industries. The Company was founded in 1922 and, through both
internal growth and acquisitions, today operates 25 heat treating plants, and
four heat treating facilities located on the premises of customers, in 14
states. These 29 facilities are grouped into 20 divisions, each with certain
operational autonomy.
 
  Lindberg provides a wide range of heat treating processes, in which ferrous,
aluminum and other specialty metals are exposed to precise temperatures and
other conditions to improve mechanical properties, durability, and wear
resistance. Among the many heat treating processes offered by the Company are
hardening, tempering and annealing, solution treating and aging, surface
treating, brazing and other specialty and ancillary processes. Lindberg
provides these services to larger industrial manufacturers with high volumes
and a variety of products as well as small, specialized manufacturers. Typical
products that the Company heat treats are aircraft components, automotive
parts, machine tools and dies, oilfield drill rig parts, consumer products and
a variety of other metal products.
 
  Lindberg has established itself as a leading commercial heat treater based
on its key competitive strengths, including its high level of quality and
service, extensive technical expertise and network of facilities, industry
certifications and national reputation. The Company delivers high quality
service on a timely basis, while its technical expertise provides the
capability to develop customized solutions that meet specific customer needs.
The Company has developed its Benchmarks of Quality process, whereby it
monitors 17 different measurements of quality throughout its heat treating
operations. Many of the Company's facilities are strategically located in
major industrial centers in the Midwest, California, Texas and the Northeast.
This network allows the Company to offer a wide range of heat treating
services in close proximity to its customers. Most of the Company's plants are
recognized with third-party quality endorsements, such as ISO 9000, QS 9000,
NADCAP, and AS 9000, and have approved vendor status for many major
manufacturers. These certifications and approvals enable the Company to
service products manufactured by or for some of the largest domestic
manufacturers, and, increasingly, represent a barrier to entry for those heat
treaters seeking to serve such manufacturers.
 
INDUSTRY
 
  Heat treating in the U.S. is performed in-house in captive heat treating
departments of manufacturers or externally by a commercial heat treating
company such as Lindberg. The U.S. Department of Commerce reported sales by
commercial heat treating companies of approximately $2 billion in 1996.
Management believes that $2 billion represents about 10% of the annual heat
treating performed in the U.S., with the balance performed in captive heat
treating departments. In-house heat treating facilities are typically part of
a larger facility, such as a steel mill or an automobile components factory,
whose large volumes justify a captive operation. Commercial heat treaters are
independent companies that specialize in heat treating or other metal
treatments and serve a large number of customers across a variety of
industries. Commercial heat treating sales, as compiled by the Metal Treating
Institute, an industry association, have grown at a compound annual rate of
approximately 8% to 9% from 1993 through 1997.
 
  Due to the time and costs associated with transporting materials and
customers' need for quick turnaround times for heat treated products,
commercial heat treating has developed as a regional industry, with customers
typically located within 100 to 200 miles of the heat treating supplier.
Consequently, the commercial heat treating industry is highly fragmented.
Commercial heat treaters are concentrated in major industrial centers of the
country. Average 1997 revenues reported by the Metal Treating Institute
members participating in its annual survey were approximately $4 million.
Management estimates that the top five commercial heat treating companies in
terms of revenues in the U.S. represent approximately 15% of the commercial
market.
 
                                      19
<PAGE>
 
  The fragmented nature of the commercial heat treating industry presents
opportunities for consolidation. Several factors have motivated smaller
commercial heat treating owners to sell to larger commercial heat treaters,
including increasing regulatory and certification requirements which are
burdensome to smaller companies, capital expenditures necessary to remain
competitive, increasing demand for technical expertise, and succession
planning considerations. In addition, a number of industry participants have
acquired heat treaters in order to expand their geographical presence and
provide expanded or enhanced service capabilities.
 
  Management expects outsourcing to be a continuing opportunity in the heat
treating industry. Many smaller companies involved in the manufacture of metal
components outsource their heat treating requirements to commercial heat
treaters in order to avoid the significant cost of heat treating equipment. In
recent years, larger manufacturers have also outsourced their heat treating
requirements due to the increased demand for technical expertise required in
heat treating and the relatively small portion of the total cost of the
finished product represented by heat treating.
 
BUSINESS STRATEGY
 
  Management believes that the market environment has created opportunities
for the Company to strengthen its market position and enhance profitability by
meeting its customers' service requirements of quality, cost and on-time
delivery. To that end, the Company pursues an internal operating strategy and
an active acquisition strategy.
 
 OPERATING STRATEGY
 
  The Company's operating strategy consists of the following elements.
 
  Focus on Service and Quality. The Company believes that maintaining and
attracting new customers depend on its ability to address customer needs for
service, timely delivery of products, quality and cost effectiveness. Heat
treating is an essential part of the customers' manufacturing process, and
customers depend on prompt, quality service to efficiently complete the
manufacturing process. In 1990, the Company established a formal Benchmarks of
Quality process to focus on improving every element of the business to
establish Lindberg as the lowest total cost provider and the preferred
business partner for its associates, customers, suppliers and stockholders.
Key goals of the process are to improve customer satisfaction and retention by
making on-time delivery, improving performance under the Company's Orders Done
Right the First Time program, achieving external quality recognition and
demonstrating process capability. Most of the Company's plants are recognized
with third-party quality endorsements, such as ISO 9000, QS 9000, NADCAP and
AS 9000, and have approved vendor status for many major manufacturers. Beyond
these designations, the Company is committed to continuously improving and
meeting its own rigorous internal standards for quality.
 
  Technical Expertise. The Company strives to provide high quality, value-
added service by offering customers its technical expertise. At most
facilities, a metallurgist with access to a historical database of heat
treating processes is available to help customers, especially smaller or
second-tier suppliers, determine appropriate processes and product
specifications. For specialized needs, the Company can draw from widely varied
skills and metallurgical knowledge throughout the organization. The ability to
provide such value-added services to its customers gives the Company a
competitive edge over smaller operators with fewer technical and financial
resources.
 
  Process Improvements and Production Efficiencies. Among the goals of the
Benchmarks of Quality process are waste reduction, increased productivity and
greater equipment utilization. Technology plays an important role in helping
Lindberg to reach these goals, although the heat treating industry tends to
experience evolutionary, rather than revolutionary, changes in technology.
Lindberg concentrates on the application of technology to improve efficiency
of the processes rather than on the development of specific technology. The
Company participates in national and international trade associations to
remain current on technological developments. Recent equipment developments
have focused on instrumentation, control and automation of existing processes.
 
                                      20
<PAGE>
 
The focus on process design and engineering is to create added value by new
applications of existing metallurgical techniques. Installing new furnaces,
upgrading systems and employing new heat treating or manufacturing techniques
are some of the means to improve processes.
 
  Flexible, Decentralized Organization. The Company operates on a
decentralized basis so that each division can react quickly and effectively to
local market conditions. The Company's divisions have considerable autonomy in
most operational areas, such as sales, pricing and hiring, and participate in
strategic planning for their own markets. In addition, the Company's
facilities tend to be clustered in certain geographic areas, which permits
individual facilities to utilize additional capacity or other heat treating
processes at alternate sites if necessary. In areas where the facilities are
clustered, the flexibility to react speedily to changes in local market
conditions and to provide a wide variety of specialized services quickly is a
significant competitive advantage for the Company.
 
  Associate Involvement. All Company associates are involved in attaining
strategic goals. To that end and in recognition of the value of skilled
associates, the Company emphasizes effective training and motivation related
to the work environment, safety, competency, communication, shared knowledge
and other aspects of the business. The Company expects each of its associates
to receive a minimum of 28 hours of annual training designed to improve
services and processes at all levels. In tying performance-based bonus
compensation to earnings and the attainment of other performance goals, the
Company provides management with incentives to continue to strive for
excellence.
 
  Strategic Partnerships. Management believes that approximately 90% of
domestic heat treating is conducted in-house by manufacturers. Since 1991, the
Company has offered dedicated heat treating services to certain larger
customers under long-term contracts through its SP 2000 program. The Company
initiated the SP 2000 program in an effort to (i) obtain new, large volume
customers that currently perform their own heat treating, (ii) retain existing
customers whose heat treating volumes may justify performing the process in-
house and (iii) capture additional volume from customers that may be using
multiple heat treaters. Under the SP 2000 program, the Company provides heat
treating services to customers at the Company's facilities or on-site at the
customers' facilities. The Company provides the technical expertise and, in
some cases, the capital required to create a heat treating operation
customized to meet the needs of the particular customer, and manages the
operation for the customer. The program provides the customer with the benefit
of Lindberg's delivery of high quality heat treating and metallurgical
expertise, guaranteed capacity, reduced inventory, improved productivity and
quick turnaround. Without the need to invest in equipment, training and
management of the process, the customer will be free to concentrate on its
core competencies. To date, the Company operates seven SP 2000 facilities and
expects to commence an eighth operation in 1998.
 
 ACQUISITION STRATEGY
 
  As industry consolidation continues, the Company expects acquisitions to be
an important part of its growth strategy. The Company is interested in
acquiring profitable businesses that complement its heat treating operations,
have a strong management team in place and can be purchased at reasonable
prices.
 
  Increase Presence in Existing Markets. The Company intends to selectively
acquire heat treating companies that further strengthen its market presence.
The Company is interested in small specialty service companies as well as
larger heat treating companies in markets in which it operates. By increasing
the number of facilities in a particular region, the Company can provide a
more comprehensive and higher level of service. For example, six of the
recently acquired companies are located in Southern California, making the
Company, management believes, the largest commercial heat treating company in
that region.
 
  Enter New Markets. The Company seeks to acquire businesses that are based in
markets in which Lindberg has no or a limited presence or that serve other
industries. In these locations, the Company is primarily interested in larger
heat treaters with market positions that provide an attractive platform for
expansion. The Company will continue to monitor certain geographical regions
and industries to identify attractive opportunities.
 
                                      21
<PAGE>
 
  Expand Service Offerings. Lindberg considers the acquisition of businesses
that expand the Company's variety of service offerings. Potential new service
offerings may include heat treating processes or other ancillary services that
complement the Company's existing heat treating services, such as coatings or
forming.
 
  Integrate and Enhance Newly Acquired Companies. The Company seeks to improve
the operations of acquired businesses by sharing its established operating
know-how, technology, technical expertise, industry knowledge and financial
resources and by leveraging Lindberg's national reputation. In markets where
the Company is well established, initial efforts at integrating acquisitions
are aimed at increasing sales by exchanging market and customer information,
combining sales and marketing efforts and sharing service capabilities,
combining administrative functions and sharing facilities and equipment. Newly
acquired businesses in existing markets often provide an opportunity for
nearby Lindberg facilities to balance production capacity within a region.
 
SERVICES
 
  The Company offers a range of heat treating services for steel, aluminum,
cast iron, titanium alloys and other metals. Services are performed on
customer-provided products at various steps in the manufacturing cycle. The
Company does not maintain a raw material inventory or own work-in-process. The
range of processing offered by the Company requires different types and sizes
of primary and secondary heat treating equipment.
 
  Heat treating improves the mechanical properties, performance, durability
and wear resistance of metals and is an important step in many manufacturing
processes involving metals. Heat treating can soften metal to improve
formability, make a part harder to improve strength, put a hard surface on a
relatively soft component to increase strength or abrasion resistance, put a
corrosion-resistant surface on an item that would otherwise corrode or toughen
a brittle product. Heat treated parts are essential to the operation of
automobiles, aircraft, spacecraft, consumer products, and heavy equipment of
every kind. Bearings, gears, aluminum bicycle frames, axles, fasteners,
camshafts, crankshafts and cutting tools are examples of products that require
heat treating.
 
  Heat treating is a process in which metal is heated and cooled under tight
controls. Heat treating processes require three basic steps: (i) heating to a
specified temperature, (ii) holding at that temperature for the appropriate
amount of time, and (iii) cooling according to a prescribed method.
Temperatures may range as high as 2400(degrees)F, and time at temperature may
vary from a few seconds to as many as 60 hours or more. Some materials are
cooled slowly in the furnace, but others must be cooled quickly, or
"quenched." Primary quenching media include water, oils, gases and polymer
solutions. Each quenching medium has specific characteristics that make it
well-suited for certain applications.
 
  Of the Company's wide range of heat treating services, the following are the
most common:
 
  HARDENING, TEMPERING AND ANNEALING are performed using a variety of media,
including electric furnaces, neutral salt baths, press quenching and vacuum
furnaces. The purpose of these processes is to create the ideal metallurgical
properties in the treated material.
 
  SOLUTION TREATING AND AGING is performed on aluminum, titanium and stainless
steel pieces to create desired properties of ductility and hardness throughout
the piece.
 
  SURFACE TREATING utilizes a specialized furnace to heat steels to an
appropriate temperature. Once the selected temperature is achieved, a carbon
or nitrogen rich gas is introduced to the furnace and elements within the gas
diffuse into the surface of the steel. The surface of the material is
transformed into a tougher, more wear resistant structure, while the core of
the material retains its ductility. Types of surface treatment include
carburizing, nitriding, carbo nitriding and ferritic nitrocarburizing.
 
  BRAZING is a process which uses heat treating to bond two different pieces.
The Company utilizes electric furnaces, vacuum furnaces and induction in its
brazing process.
 
                                      22
<PAGE>
 
OPERATIONS
 
  The Company operates 25 of its own heat treating plants, each serving an
average of 350 customers. A typical plant employs 20 to 70 individuals,
including a division manager, a plant manager, sales personnel, a
metallurgist, quality personnel and an office manager. Each facility operates
24 hours per day, five or more days per week, depending on volume or seasonal
activity.
 
  Each plant is equipped with furnaces of various types, sizes and support
equipment. Many pieces of primary equipment are capable of running several
different processes. Auxiliary items include fixtures, atmosphere generators,
material handling equipment, cleaning equipment and metallurgical testing
equipment. Key suppliers provide electricity and natural gas. Other important
purchased materials include quench oils, process gases, fixtures, maintenance
supplies, laboratory and testing supplies and auxiliary equipment.
 
  Each plant is located in a major industrial area, in most cases serving
customers in that region. The Company typically processes orders within one to
five days. In addition, customers generally want to minimize the expense and
risks associated with transporting their products over long distances to and
from commercial heat treating plants. Consequently, customers tend to prefer
heat treaters located in their own areas. They deliver and pick up their
parts, or the plant provides some delivery with its own trucking. This market
configuration has led to some degree of specialization for most of the
Company's plants, with each plant focusing on the particular needs of its
major customers in its area.
 
  Many large customers and end-users have the technical expertise to provide
processing specifications on the components, which they design. However,
smaller manufacturers and second-tier suppliers often specify only the
material of construction and metallurgical properties required. In these
cases, the Company's plants determine the proper heat treating processes and
fixturing to meet customer requirements. This variety of needs creates a job
shop environment where customized processing instructions are developed or
reviewed for each part the plant processes.
 
  Because the industry is fragmented and localized, the Company's operations
are decentralized so each plant can react quickly and effectively to local
market conditions. The Company's divisions have considerable autonomy in most
operational areas, including sales, pricing, hiring and the development of
non-financial systems, and participation in strategic planning for their
respective local markets.
 
  The Company's corporate office oversees the financial management of the
Company and serves as a resource to the divisions in such areas as finance and
human resources. Two group vice presidents at the corporate level oversee heat
treating operations. The Company also maintains an operating staff which
includes an engineering and market development manager, controller, and
several quality, engineering, and information systems personnel to provide
support to all heat treating operations.
 
  Each plant, generally, uses a common computer system located on site, which
provides for order entry, billing, plant routing, shipping, and process
management. The Company is developing new software, which will replace and
enhance the functionality of the current proprietary system. The new system,
expected to be installed and operational by 1999, will also provide the
flexibility for the automation of other processes in the future.
 
  In April 1998, the Company announced the establishment of its first heat
treating operation in Mexico. The site is expected to be operational in
Monterrey during the third quarter of 1998. The Company intends to use the
plant to establish a base of operations that could expand over time to meet
other market needs, particularly the growing metal-working markets of northern
Mexico.
 
                                      23
<PAGE>
 
PROPERTIES
 
  The principal plants of the Company, the approximate square footage and
whether the plants are leased or owned are as follows:
 
<TABLE>
<CAPTION>
            LOCATION                                SQUARE FEET LEASED OR OWNED
            --------                                ----------- ---------------
      <S>                                           <C>         <C>
      Melrose Park, IL.............................   200,000       Owned
      Houston, TX (1)..............................   200,000       Owned
      Racine, WI...................................   193,500       Owned
      Solon, OH....................................    96,300       Owned
      Lansing, MI..................................    83,800       Owned
      Paramount, CA (1)............................    80,000       Leased
      Rancho Dominguez, CA.........................    55,000       Leased
      New Berlin, WI...............................    50,000       Owned
      St. Louis, MO................................    50,000       Owned
      Gardena, CA..................................    45,000       Leased
      Worcester, MA................................    45,000       Owned
      Huntington Park, CA (1)......................    40,000       Owned
      Minneapolis, MN..............................    40,000       Leased
      Westminster, CA..............................    38,400       Owned
      Berlin, CT...................................    36,700       Owned
      Santa Fe Springs, CA.........................    36,000       Leased
      Waterbury, CT................................    32,600       Leased
      Los Angeles, CA..............................    31,000       Owned
      Tulsa, OK....................................    30,300       Owned
      Wichita, KS..................................    30,000       Leased
      Garden Grove, CA.............................    21,000       Leased
      Rochester, NY................................    17,000       Leased
- --------
(1) Consisting of two plants.
 
  The following SP 2000 operations are located in customer facilities at the
locations indicated (in each case with no substantial occupancy charge):
 
<CAPTION>
          LOCATION                                  SQUARE FEET
          --------                                  -----------
      <S>                                           <C>         <C>
      Wyomissing, PA...............................    15,000
      Bedford Heights, OH..........................     9,600
      Clintonville, WI.............................     5,000
      Downers Grove, IL............................     4,500
</TABLE>
 
  The Company's corporate office consists of an 8,900-square-foot leased space
located in Rosemont, Illinois. Four of the Company's leases will expire within
the next three years, three of which are renewable at the option of the
Company.
 
  The Company's facilities are suitable for their respective uses and are, in
general, adequate for the Company's current needs. All facilities serve
largely localized markets and customers. Those providing products in markets
where economic activity is strong at any particular time operate at relatively
high levels of plant utilization. The Company believes that it has sufficient
capacity at its current facilities to absorb additional workloads at
reasonably anticipated levels.
 
CUSTOMERS
 
  The Company serves about 9,000 customers that range from owner-operated job
shops to large, national manufacturing companies. The Company's largest direct
customer accounted for less than 3% of the Company's net sales in 1997. The
ten largest customers, excluding SP 2000 customers, accounted for
approximately 13% of net sales in 1997.
 
                                      24
<PAGE>
 
  The Company's customers are suppliers to companies operating in a variety of
manufacturing industries, including commercial aerospace, automotive/light
truck, off-road vehicle, oilfield equipment, defense, consumer products,
building components, tool and die, agriproducts and a variety of other
industries. The Company also provides heat treating services directly to those
companies in such industries.
 
  Management estimates that customers serving the commercial aerospace
industry currently account for approximately 30% to 35% of the Company's net
sales and that customers serving the automotive/light truck industry account
for approximately 15% to 20% of net sales. These estimates are based on an
annual survey of the Company's division managers and reflect the knowledge of
each division's customer base. Because the Company provides heat treating
services at different stages of the manufacturing process to a wide range of
manufacturers and their suppliers in a variety of industries, the Company
cannot measure precisely its penetration of specific industries.
 
SALES AND MARKETING
 
  Each division within the Company has its own sales function, coordinated
regionally if appropriate. Each plant is responsible for developing and
distributing its own brochures and sales materials. Minimal advertising is
employed on a local basis.
 
  The Company's sales force consists of one or two sales representatives per
plant. In addition, each division manager is actively involved in local sales
efforts. These individuals are responsible for customer service, pricing and
quoting at their location. Local sales efforts are enhanced by plant
metallurgists who may discover opportunities as they consult with customers on
heat treating specifications. Services are generally quoted on a per pound,
per piece, or per furnace load basis. Quotes on a per pound basis represent
the most typical arrangement.
 
  The Company's local sales efforts are augmented with marketing, sales,
metallurgical and engineering efforts carried out by personnel at the
corporate level. This includes national customer contact, regional sales
coordination where possible, and SP 2000 market development.
 
COMPETITION
 
  Due to the regional and highly fragmented nature of the commercial heat
treating industry, each plant has competition of varying degrees of intensity.
Competition consists of local heat treating owner-operators and certain
facilities of larger regional heat treating companies. Each plant competes in
its market on the basis of service and on-time delivery, quality, and price.
Local management at each of the Company's facilities is largely responsible
for its own pricing and cost control, and thus has the flexibility to respond
to local market conditions.
 
  National competition in the commercial heat treating industry is limited.
There are competitors in particular localities that are larger than the
Company's facility located in those markets. Such competitors may also be
divisions of larger regional companies and, therefore, have access to
additional resources. Competition also exists from in-house heat treating
facilities of manufacturers, although the Company considers such manufacturers
as potential customers.
 
  Management believes that the Company's national presence, size and
reputation for quality and service position it as a preferred supplier to many
of the nation's largest corporations. These companies have exceptionally
strict quality standards and often prefer a primary supplier relationship. The
certification requirements by many of these major companies are a significant
barrier to entry for heat treaters seeking to serve such customers.
 
THIXOMAT
 
  The Company is a minority stockholder in a consortium of industrial partners
called Thixomat, Inc. Thixomat, Inc. was formed in 1989 to promote and
commercialize the Thixomolding(TM) technology, a specialized
 
                                      25
<PAGE>
 
molding process. The Company's $434,000 investment in Thixomat, Inc. is
carried at cost. In addition, the Company operates a THX Molding division,
using the Thixomolding(TM) process. This operation is in a start-up mode, and
is not expected to contribute materially to the Company's results in the
foreseeable future.
 
ASSOCIATES
 
  Currently, the Company employs approximately 1,200 associates within its
continuing operations. Of these associates, approximately 190 are covered by
collective bargaining agreements, none of which are subject to renewal
negotiation in 1998 and 1999. The Company believes that its employee relations
are good.
 
LITIGATION
 
  The Company is a defendant in a qui tam (whistle-blower) lawsuit filed by a
former employee of the Company under seal on or about July 25, 1996 in the
U.S. District Court for the Central District of California, seeking to recover
damages and civil penalties arising from allegedly false statements and claims
made by the Company in violation of the federal False Claims Act (the "FCA")
and for damages resulting from the plaintiff's allegedly wrongful discharge
and retaliatory acts by the Company. The complaint alleges that the Company
defrauded the government by submitting invoices and other documentation
falsely representing that certain metal parts had been treated at one Company
facility by equipment that met certain industry and government standards.
Private parties may bring actions under the FCA on behalf of the government
and share in any recovery, and may recover attorneys' fees. The FCA provides
for civil penalties of up to $10,000 for each false claim, plus trebling of
damages sustained by the government. A qui tam complaint must be filed under
seal (without service on the defendant) and may remain under seal while the
government conducts its own investigation and determines whether to join the
action. The government notified the Company of the complaint in late May 1998,
stating that the court partially unsealed the complaint, which the government
gave to the Company, to facilitate discussions between the parties. The
government told the Company that it has not yet determined whether to join the
action, and that it was also independently investigating the hardness testing
certification of certain items treated at the same Company facility. The
Company has responded to a civil investigative demand from the government and
is cooperating with the government in its investigation. Although the
activities that are the subject of the investigation and the lawsuit appear to
be limited to one plant, the Company cannot predict whether the government
will join the action nor whether the action or the government's investigation
will have a material adverse effect on the Company.
 
  The Company is a party to various other lawsuits and claims arising in the
ordinary course of business. After review and consultation with legal counsel,
the Company believes that any liability resulting from these matters would not
materially affect its financial condition or results of operations.
 
ENVIRONMENTAL REGULATION
 
  Lindberg uses some environmentally hazardous materials in its business. The
Company has made expenditures to comply with environmental laws and
regulations, including studies, investigations and remediation of ground
contamination, and expects to make such expenditures in the future in its
continued effort to comply with existing and future requirements. While such
expenditures to date have not materially affected the Company's capital
expenditures, competitive position, financial condition or results of
operations, there can be no assurance that more stringent regulation or
enforcement in the future will not have such effects.
 
  In some cases, the Company has notified state authorities of a possible need
for remediation at sites it previously operated or currently operates. At all
such sites, costs which may be incurred are difficult to predict accurately
until the level of contamination is determined, and such costs would be
subject to increase if more contamination is discovered during investigation
or remediation or if state authorities require more remediation than
anticipated. Such costs may be less if the contamination proves to be less
than currently expected and to the extent costs are covered by insurance or
are allocable to others.
 
 
                                      26
<PAGE>
 
  The Company has also been notified by various state and federal governmental
authorities that they believe the Company may be a "potentially responsible
party" or otherwise have responsibility for clean-up obligations at four waste
disposal sites which were never owned or operated by the Company. The Company
is participating in negotiations for settlement with the relevant authorities
or other parties it believes to be responsible for these clean-up obligations
and the Company expects its responsibility to be of a minor nature. The
Company believes that the ultimate outcome will not have a material effect on
its financial condition or results of operations.
 
  At March 31, 1998, the Company had reserves of approximately $2.2 million to
cover future anticipated costs of investigation and remediation. It has
estimated a range of costs in establishing these reserves. Of such reserves,
approximately $1.2 million relates to environmental issues at Industrial Steel
Treating Co. (acquired in 1998) which have been reported to California
environmental authorities. Approximately $675,000 relates to the investigation
and remediation, under the supervision of the Illinois Environmental
Protection Agency, of contamination at the Company's Melrose Park, Illinois
facility. These reserves give no effect to possible recoveries from insurers
or other potentially responsible parties, nor do these reserves reflect any
discount for the several years over which investigation or remediation amounts
may be paid out.
 
  The Company has policies related to environmental compliance, but does not
currently have standardized corporate-wide internal environmental assessment
procedures. The Company is currently in the process of implementing
standardized assessment procedures for its facilities, many of which have not
recently been fully assessed for potential environmental compliance. No
assurance can be given that the Company will not be subject to environmental
claims, penalties or remediation costs in the future that would have a
material adverse effect on the Company's results of operations or financial
condition or that the compliance assessments, if implemented, will reduce the
Company's exposure to potential environmental liabilities.
 
                                      27
<PAGE>
 
                                  MANAGEMENT
 
  The executive officers and directors of the Company are:
 
<TABLE>
<CAPTION>
   NAME                     AGE POSITION
   ----                     --- --------
   <S>                      <C> <C>
   George H. Bodeen........  74 Chairman of the Board of Directors
   Leo G. Thompson.........  57 President, Chief Executive Officer and Director
   Stephen S. Penley.......  48 Senior Vice President, Chief Financial Officer and
                                Secretary
   Michael W. Nelson.......  51 Senior Group Vice President
   Paul J. McCarren........  51 Group Vice President
   Dr. Raymond F. Decker...  67 Director
   Raymond A. Jean.........  55 Director
   John W. Puth............  69 Director
   J. Thomas Schanck.......  67 Director
</TABLE>
 
  GEORGE H. BODEEN has served as Chairman of the Board of Directors of the
Company since December 1980. He was the Company's Chief Executive Officer from
1965 until December 1990 when he retired from that position and was President
from April 1965 to October 1987.
 
  LEO G. THOMPSON has served as President and Chief Executive Officer of the
Company since January 1991. He joined the Company as President, Chief
Operating Officer and a director in 1987. Prior thereto, he was Vice President
and a director of Clevite Industries Inc. (manufacturer of auto and truck
related parts) and President of the Engine Parts Division of that company from
1985 to 1987.
 
  STEPHEN S. PENLEY has served as Chief Financial Officer since January 1989,
Senior Vice President since July 1993 and Secretary since October 1990. He was
Vice President from January 1989 to July 1993 and Treasurer from January 1989
to July 1996. He joined the Company as Corporate Controller in late 1987.
Prior to joining the Company, he was Corporate Controller of Clevite
Industries Inc. from 1985 to 1987 and held various other positions at the
company before that time.
 
  MICHAEL W. NELSON has served as Senior Group Vice President since March
1998. Prior thereto, he was Senior Vice President and President of Heat Treat
Operations from July 1993 and Vice President-Central Region from July 1990 to
June 1993. He joined the Company in 1983 as an in-house consultant. Before
joining the Company, he was a consultant to a variety of manufacturing
businesses.
 
  PAUL J. MCCARREN has served as Group Vice President and Manager of West
Coast Operations since March 1998. Prior thereto, he held various operating
positions with the Company. He joined the Company in 1972 as a metallurgist.
 
  DR. RAYMOND F. DECKER has served as a director of the Company since 1987. He
is President and Chief Executive Officer of University Science Partners, Inc.
(a general partnership that funds, develops and commercializes university and
national laboratory technology) since August 1986, Chairman since December
1988 and Chief Executive Officer from December 1988 to April 1993, of
Thixomat, Inc. (a general partnership formed to promote and commercialize
Thixomolding(TM) technology and in which the Company has a 18% interest). Dr.
Decker is a director of Wavemat, Inc. (designer and manufacturer of microwave
plasma systems and sources) and Special Metals Corporation (manufacturer of
high temperature nickel superalloys).
 
                                      28
<PAGE>
 
  RAYMOND A. JEAN has served as a director of the Company since 1995. He is a
director of Varlen Corporation (manufacturer of engineered products), and has
been its President since May 1997 and Chief Operating Officer since February
1993. Prior thereto, he was Executive Vice President from February 1993 and
Group Vice President from August 1988 to January 1993 of Varlen Corporation.
 
  JOHN W. PUTH has served as a director of the Company since 1987. He is
President of J. W. Puth Associates (industrial consultants) since December
1987 and a director of L.B. Foster Co. (manufacturer of rail, piling and
tubular products), U.S. Freightways Corporation (operator of general
commodities carriers), Allied Products Corporation (manufacturer of
agricultural and industrial machinery), A.M. Castle & Co. (operator of metals
service centers) and Brockway Standard Holdings Corporation.
 
  J. THOMAS SCHANCK has served as a director of the Company since 1975. He was
Vice Chairman of Illinois Tool Works Inc. (producer of specialty engineered
products and systems) from September 1986 until his retirement in December
1988.
 
                                      29
<PAGE>
 
                             
                          PRINCIPAL STOCKHOLDERS     
   
  The following table contains certain information regarding beneficial
ownership of the Common Stock as of May 28, 1998 (except as otherwise noted),
and as adjusted to reflect the completion of the Offering, by (i) each person
or group known by the Company to own beneficially more than five percent of
the Common Stock, (ii) each director, (iii) each executive officer, and (iv)
all directors and executive officers as a group.     
 
<TABLE>   
<CAPTION>
                                                           PERCENT
                                                    BENEFICIALLY OWNED(2)
                                     NUMBER OF      ------------------------
                                SHARES BENEFICIALLY   BEFORE        AFTER
NAME                                 OWNED(1)        OFFERING      OFFERING
- ----                            -------------------  --------     ----------
<S>                             <C>                 <C>           <C>
Ira Sochet(3)..................       799,200               16.4%         13.6%
Nancy L. Bodeen(4).............       455,976                9.4           7.8
The Killen Group, Inc.(5)......       408,132                8.4           7.0
Dimensional Fund Advisors,
 Inc.(6).......................       343,500                7.1           5.9
Ronald E. Byrd(7)..............       274,220                5.6           4.7
George H. Bodeen(8)(9).........       212,164                4.3           3.6
Raymond F. Decker(9)...........        13,000                  *             *
Raymond A. Jean(9).............         6,500                  *             *
John W. Puth(9)................         3,500                  *             *
J. Thomas Schanck(9)...........        12,500                  *             *
Leo G. Thompson(9).............       138,750                2.8           2.3
Stephen S. Penley(9)...........        36,615                  *             *
Michael W. Nelson(9)...........        35,700                  *             *
Paul J. McCarren(9)............        13,375                  *             *
All directors and executive
 officers
 as a group (9 persons)(10)....       472,104                9.4           7.8
</TABLE>    
- --------
*Less than 1%.
 (1) Unless otherwise indicated, the persons named in the table above have
     sole voting and investment power over all shares shown as beneficially
     owned by them. Beneficially owned shares include shares subject to
     options exercisable within 60 days of May 28, 1998.
 (2) Based on 4,866,581 shares outstanding as of May 28, 1998.
 (3) Based on report of ownership on amendment to Schedule 13D, dated February
     10, 1998, filed with the SEC reporting ownership as of January 23, 1998.
     The address of Ira Sochet is 9350 S. Dixie Highway, Suite 1260, Miami,
     Florida 33156.
 (4) Includes 417,176 shares over which Nancy L. Bodeen has sole voting and
     sole dispositive power and 38,800 shares held by a family charitable
     foundation over which shares she has shared voting and shared dispositive
     power as co-trustee with her husband, George H. Bodeen, the Chairman of
     the Board and a director of the Company. Excludes 47,634 shares held by a
     trust created under the will of L. A. Lindberg of which trust Mrs. Bodeen
     is the beneficiary but over which shares she has no voting or dispositive
     power. Mrs. Bodeen's address is 1180 Whitebridge Hill, Winnetka, Illinois
     60093.
 (5) Based on a report of ownership on Schedule 13G, dated February 17, 1998,
     filed with the SEC reporting ownership as of December 31, 1997. The
     Killen Group, Inc. has sole power to vote 83,904 shares. The address of
     the Killen Group, Inc. is 1199 Lancaster Avenue, Berwyn, Pennsylvania
     19312.
 (6) Based on a report of ownership on an amendment to Schedule 13G, dated
     February 9, 1998, filed with the SEC reporting ownership as of December
     31, 1997. Dimensional Fund Advisors, Inc. ("Dimensional"), a registered
     investment advisor, is deemed to have beneficial ownership of 343,500
     shares as of December 31, 1997, all of which shares are held in
     portfolios of DFA Investment Dimensions Group Inc., a registered open-end
     investment company, or in series of the DFA Investment Trust Company, a
     Delaware business trust or the DFA Group Trust, and DFA participation
     Group Trust, investment vehicles for qualified
 
                                      30
<PAGE>
 
    employee benefit plans, for all of which Dimensional serves as investment
    manager. Dimensional disclaims beneficial ownership of all such shares.
    The address of Dimensional is 1299 Ocean Avenue, 11th Floor, Santa Monica,
    California 90401.
 (7) Ronald E. Byrd has shared voting and dispositive power with his spouse
     over 199,220 shares. Excludes 31,706 shares over which his spouse has
     sole voting and dispositive power and 33,480 shares held by a trust
     created under the will of L. A. Lindberg of which trust his spouse is the
     sole beneficiary but over which she has no voting or dispositive power.
     Mr. Byrd's address is 24 Marsh Point Road, Amelia Island, Florida 32034.
 (8) George H. Bodeen has sole voting and sole dispositive power over 92,250
     shares which includes 75,750 shares he owns directly, 11,500 shares
     subject to currently exercisable options, and 5,000 shares held by his
     personal retirement trust of which he is co-trustee and co-beneficiary.
     In addition, Mr. Bodeen has shared voting and sole dispositive power over
     81,114 shares as co-trustee of trusts created under the will of L. A.
     Lindberg. Mr. Bodeen also has shared voting and shared dispositive power
     over 38,800 shares as co-trustee with his wife, Nancy L. Bodeen, of a
     family charitable foundation.
 (9) Includes shares subject to stock options which are exercisable within 60
     days of May 28, 1998, as follows: George H. Bodeen and J. Thomas Schanck,
     11,500 shares each; Raymond F. Decker, 8,500 shares; Raymond A. Jean,
     6,000 shares; John W. Puth, 2,500 shares; Leo G. Thompson, 62,250 shares;
     Stephen S. Penley, 19,500 shares; Michael W. Nelson, 28,500 shares; and
     Paul J. McCarren, 9,175 shares.
(10) Includes 119,914 shares with shared voting power, and 159,425 shares
     subject to stock options which are currently exercisable or become
     exercisable within 60 days of May 28, 1998.
 
                                      31
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
 
  The authorized capital stock of the Company consists of 25,000,000 shares of
Common Stock, $.01 par value per share, and 1,000,000 shares of preferred
stock, $.01 par value per share. The Company's Certificate of Incorporation
authorizes the Board of Directors to issue, without further action by the
stockholders, shares of preferred stock in one or more series and to fix their
rights, preferences, privileges and restrictions thereof. The Company has not
issued any shares of preferred stock. Based on 4,866,581 shares issued and
outstanding as of May 31, 1998, upon completion of the Offering, there will be
5,866,581 shares of Common Stock issued and outstanding (6,016,581 shares if
the Underwriters exercise their over-allotment option in full), excluding
shares issuable under currently outstanding options held by officers and
directors.
 
COMMON STOCK
 
  Subject to the rights of the holders of any then outstanding preferred
stock, holders of Common Stock are entitled to receive distributions on Common
Stock as may be declared by the Board of Directors. In any liquidation, each
outstanding share of Common Stock will entitle its holder to share (based on
the percentage of shares held) in the assets of the Company that remain after
payment of all liabilities, subject to the preference rights of the holders of
outstanding preferred stock, if any.
 
  Holders of Common Stock are entitled to one vote for each share on all
matters submitted to a stockholder vote. Unless otherwise required, the
holders of Common Stock possess the exclusive voting power. Stockholders do
not have cumulative voting in the election of directors. This means that the
holders of a majority of the Common Stock can elect all of the directors of a
class standing for election and the holders of the remaining Common Stock
could not elect any director of that class.
 
  Common stockholders have no conversion, sinking fund, redemption or
preemptive rights. All outstanding shares of Common Stock are, and the shares
of Common Stock offered hereby will be when issued, fully paid and
nonassessable.
 
  The Company furnishes stockholders with annual reports containing audited
consolidated financial statements, which contain an opinion of the Company's
independent public accountants. The Company also furnishes stockholders with
quarterly reports for the first three quarters of each year, which contain
unaudited financial information.
 
  The Common Stock is quoted on the Nasdaq National Market. The transfer agent
and registrar for the Common Stock is Harris Trust and Savings Bank, 311 West
Monroe Street, Chicago, Illinois 60690.
 
ANTI-TAKEOVER EFFECTS OF THE COMPANY'S GOVERNING DOCUMENTS AND DELAWARE
CORPORATE LAW
 
  Certain provisions of the Company's Certificate of Incorporation and By-laws
may have anti-takeover effects and may discourage, delay or prevent a third
party from gaining control of the Company by means of a tender offer, a proxy
contest for a majority of the Board of Directors or otherwise, including an
action that might result in payment of a premium over the market price for the
Common Stock. These provisions (i) classify the Board of Directors into three
classes, having three-year terms that expire in successive years, (ii) provide
that only the Board of Directors, the Chairman and the President may call
special meetings of stockholders, (iii) require the affirmative vote of the
holders of at least two-thirds of the outstanding voting stock or approval by
a majority of the Board of Directors to change the number of directors, (iv)
eliminate action by written consent of stockholders without a meeting, and (v)
permit the Board of Directors to issue up to one million shares of preferred
stock and fix their preferences, privileges and restrictions without further
action by the stockholders. The Company's Certificate of Incorporation also
requires the affirmative vote of the holders of two-thirds of the Company's
voting securities to approve (i) certain mergers and other major corporate
transactions with holders of 10% or more of the Company's voting securities
unless approved by the Board of Directors prior to such 10% or greater
ownership or by sufficient members of the Board of Directors who were
directors prior to such
 
                                      32
<PAGE>
 
ownership to constitute a majority of the total number of directorships
(including vacancies), (ii) liquidation or dissolution of the Company, and
(iii) amendments to these and certain other provisions of the Company's
Certificate of Incorporation. There are also notice requirements for
stockholders to nominate directors or present proposals at meetings of
stockholders.
 
  The Delaware General Corporation Law generally prohibits the Company from
merging with an "interested stockholder" (a holder of 15% or more of the
Common Stock) for three years if the Company will not be the surviving entity
in the merger. Delaware law also generally prohibits the Company from selling
10% or more of its assets to an interested stockholder. The Company can enter
into these transactions, however, if the Board of Directors approves the
proposed transaction before the stockholder became an interested stockholder
or if the Company's Board of Directors and the holders of at least 66 2/3% of
voting shares (excluding shares owned by the interested stockholder) approve
the transaction.
 
  In addition, the Company has a stockholder rights plan, established November
21, 1996, when the Board of Directors declared a dividend of one common share
purchase right for each outstanding share of Common Stock. Such rights become
exercisable ten days after a person or group, whose action has not received
prior approval from the Board of Directors, acquires beneficial ownership of
20% or more of the Company's outstanding Common Stock or ten business days
after a person or group commences or announces an intention to commence a
tender or exchange offer that could result in the acquisition of 20% of the
Company's outstanding Common Stock. Each right then may be exercised to
acquire one share of Common Stock at an exercise price of $40, subject to
adjustment. In addition, upon the occurrence of certain events, and upon
payment of the then-current purchase price, the rights may "flip in" and
entitle holders to buy the Company's Common Stock or "flip over" and entitle
the holders to buy common stock of the acquiring entity in such amount that
the market value is equal to twice the purchase price. The rights may be
redeemed by the Company at $.01 per right at any time until the tenth day
following the public announcement that a 20% position has been acquired. The
rights expire on November 21, 2006.
 
                                      33
<PAGE>
 
                                 UNDERWRITING
 
  ABN AMRO Incorporated and McDonald & Company Securities, Inc. have severally
agreed to purchase from the Company the respective number of shares of Common
Stock set forth opposite their names below:
 
<TABLE>
<CAPTION>
         UNDERWRITER                                            NUMBER OF SHARES
         -----------                                            ----------------
      <S>                                                       <C>
      ABN AMRO Incorporated....................................      500,000
      McDonald & Company Securities, Inc.......................      500,000
                                                                   ---------
          Total................................................    1,000,000
                                                                   =========
</TABLE>
  The Underwriting Agreement provides that the obligations of the Underwriters
are subject to approval of certain legal matters by counsel and to various
other conditions. The nature of the Underwriters' obligations is such that
they are committed to purchase and pay for all of the above shares of Common
Stock if any are purchased.
 
  The Underwriters propose to offer the shares of Common Stock to the public
initially at the public offering price stated on the cover page of this
Prospectus and to certain selected dealers that are members of the National
Association of Securities Dealers, Inc. at such price less a concession of
$.50 per share, and that such dealers may reallow a concession of $.10 per
share to certain other dealers. After the public offering, the offering price
and other selling terms may be changed by the Underwriters. The shares of
Common Stock offered hereby are included for quotation on the Nasdaq National
Market under the symbol "LIND."
 
  The Company has granted to the Underwriters a 30-day over-allotment option
to purchase from the Company up to an aggregate of 150,000 additional shares
of Common Stock, exercisable at the public offering price less the
underwriting discount. The Underwriters may exercise such option only to cover
over-allotments made in connection with the sale of Common Stock offered by
this Prospectus. If the Underwriters exercise such over-allotment option, then
each of the Underwriters will have a firm commitment, subject to certain
conditions, to purchase approximately the same percentage of such additional
shares as it was obligated to purchase under the Underwriting Agreement.
 
  Subject to certain exceptions, the Company, its executive officers and
directors have agreed that for a period of 90 days after the later of (i) the
date on which the registration statement of which this Prospectus forms a part
is declared effective by the SEC or (ii) the first date on which the shares
are bona fide offered to the public, they will not sell or otherwise dispose
of any shares Common Stock without the prior written consent of the
Underwriters.
 
  The Underwriters' consent is not required for the grant of stock options
under stock option plans or the issuance of Common Stock upon the exercise of
stock options previously granted, upon exercise of Common Share Purchase
Rights or the issuance of Common Stock as consideration for acquisitions.
 
  The Company has agreed to indemnify the Underwriters against certain
liabilities, losses and expenses, including those under the Securities Act of
1933, or to contribute to payments that the Underwriters may be required to
make in respect thereof.
 
  In connection with the Offering, the Underwriters may purchase and sell the
Common Stock in the open market. These transactions may include over-allotment
and stabilizing transactions, "passive" market making 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
Company in the Offering. The Underwriters also may impose a penalty bid,
whereby selling concessions allowed to syndicate members or other broker-
dealers for the shares of Common Stock sold in the Offering for their account
may be reclaimed by the syndicate if such shares 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
 
                                      34
<PAGE>
 
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.
 
  As permitted by Rule 103 under the Securities Exchange Act of 1934, certain
Underwriters (and selling group members, if any) that are market makers
("passive market makers") in the Common Stock may make bids for or purchases
of the Common Stock in the Nasdaq National Market until such time, if any,
when a stabilizing bid for the Common Stock has been made. Rule 103 generally
provides that (i) a passive market maker's net daily purchase of the Common
Stock may not exceed 30% of its average daily trading volume in the shares of
Common Stock for the two full consecutive calendar months (or any 60
consecutive days ending within the ten days) immediately preceding the filing
date of the registration statement of which this Prospectus forms a part, (ii)
a passive market maker may not effect transactions or display bids for the
Common Stock at a price that exceeds the highest independent bid for the
Common Stock by persons who are not passive market makers, and (iii) bids made
by passive market makers must be identified as such.
 
                                 LEGAL MATTERS
 
  Certain legal matters in connection with the sale of these securities will
be passed on for the Company by Bell, Boyd & Lloyd, Chicago, Illinois, and for
the Underwriters by Vedder, Price, Kaufman & Kammholz, Chicago, Illinois.
 
                                    EXPERTS
 
  The consolidated balance sheets of Lindberg Corporation as of December 31,
1997 and 1996, and the consolidated statements of earnings, stockholders'
equity and cash flows for the years ended December 31, 1997, 1996 and 1995
included in this Prospectus, have been audited by Arthur Andersen LLP,
independent public accountants, as indicated in their report with respect
thereto, and are included herein in reliance upon the authority of said firm
as experts in accounting and auditing in giving said reports.
 
                             AVAILABLE INFORMATION
 
  The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Reports, registration
statements, proxy statements and other information filed by the Company with
the Commission can be inspected and copied at the public reference facilities
maintained by the Commission at Judiciary Plaza, 450 Fifth Street, N.W.,
Washington, D.C. 20549, and at the Commission's Regional Offices, 500 West
Madison Street, Chicago, Illinois 60661, and 7 World Trade Center, New York,
New York 10048. Copies of such material can be obtained from the Public
Reference Section of the Commission, 450 Fifth Street, N.W., Washington, D.C.
20549, at prescribed rates. The Commission maintains a Web site
(http://www.sec.gov) that contains reports, proxy and information statements
and other information regarding registrants, such as the Company, which are
filed electronically with the Commission. Copies of certain reports, proxy
statements and other information filed by the Company can be inspected at the
offices of National Association of Securities Dealers, Inc., 1735 K Street,
N.W., Washington, D.C. 20006-1500.
 
  The Company has filed a Registration Statement on Form S-2 (together with
all amendments and exhibits thereto, the "Registration Statement") under the
Securities Act of 1933, as amended, with respect to the Common Stock offered
hereby. This Prospectus, filed as part of the Registration Statement, does not
contain all the information set forth in the Registration Statement, certain
portions of which have been omitted as permitted by the rules and regulations
of the Commission. For further information regarding the Company and the
Common Stock offered hereby, reference is made to the Registration Statement,
which may be inspected or copied as
 
                                      35
<PAGE>
 
described in the preceding paragraph. Statements contained in this Prospectus
as to the contents of any contract or other document referred to herein are
not necessarily complete and in each case reference is made to the copy of
such contract or document filed as an exhibit to the Registration Statement,
each such statement being qualified in its entirety by such reference.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents filed previously with the Securities and Exchange
Commission under Section 13 of the Exchange Act are incorporated herein by
reference:
 
    1. The Company's Annual Report on Form 10-K for 1997;
 
    2. The Company's Quarterly Report on Form 10-Q for the three months ended
  March 31, 1998;
 
    3. The Company's Current Reports on Form 8-K dated January 16, 1998 and
  April 23, 1998; and
 
    4. The description of the Company's Common Stock Purchase Rights in the
  Company's registration statement on Form 8-A for the registration of such
  Rights under Section 12(g) of the Securities Exchange Act of 1934,
  effective December 12, 1996 (File No. 0-8287).
 
  Each document filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior
to the termination of the Offering shall be deemed to be incorporated by
reference in this Prospectus and to be a part of this Prospectus from the date
of filing of such document. Any statement contained in this Prospectus or in a
document incorporated or deemed to be incorporated by reference in this
Prospectus shall be deemed to be modified or superseded for purposes of the
Registration Statement and this Prospectus to the extent that a statement
contained in this Prospectus, or in any subsequently filed document which also
is or is deemed to be incorporated by reference in this Prospectus, modifies
or supersedes such statement. Any such statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of the Registration Statement or this Prospectus.
 
  The Company will provide without charge to each person to whom this
Prospectus is delivered, upon the written or oral request of any such person,
a copy of any or all of the documents that are incorporated by reference in
this Prospectus, other than exhibits to such documents (unless such exhibits
are specifically incorporated by reference into such documents). Requests
should be directed to Stephen S. Penley, Lindberg Corporation, 6133 North
River Road, Suite 700, Rosemont, Illinois 60018 (telephone: (847) 823-2021).
 
                                      36
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
UNAUDITED INTERIM CONDENSED FINANCIAL STATEMENTS:
  Unaudited Condensed Consolidated Balance Sheet as of March 31, 1998.....  F-2
  Unaudited Condensed Consolidated Statements of Earnings for the three-
   month periods ended March 31, 1998 and 1997............................  F-3
  Unaudited Condensed Consolidated Statements of Cash Flows for the three-
   month periods ended March 31, 1998 and 1997............................  F-4
  Notes to Unaudited Condensed Consolidated Financial Statements..........  F-5
AUDITED FINANCIAL STATEMENTS:
  Report of Independent Public Accountants................................  F-7
  Consolidated Balance Sheets as of December 31, 1997 and December 31,
   1996...................................................................  F-8
  Consolidated Statements of Earnings for the years ended December 31,
   1997, 1996 and 1995....................................................  F-9
  Consolidated Statements of Cash Flows for the years ended December 31,
   1997, 1996 and 1995.................................................... F-10
  Consolidated Statements of Stockholders' Equity......................... F-11
  Notes to Consolidated Financial Statements.............................. F-12
</TABLE>
 
                                      F-1
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                 UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                                    MARCH 31,
                              ASSETS                                   1998
                              ------                               ------------
<S>                                                                <C>
CURRENT ASSETS:
  Cash............................................................ $    546,325
  Receivables--Net................................................   18,894,122
  Prepaid and Refundable Income Taxes.............................       14,011
  Prepaid Expenses................................................      946,153
  Net Assets of Discontinued Operations...........................   17,354,934
  Other Current Assets............................................      603,264
                                                                   ------------
Total Current Assets..............................................   38,358,809
PROPERTY AND EQUIPMENT:
  Cost............................................................   95,849,749
  Less-Accumulated Depreciation...................................  (53,801,229)
                                                                   ------------
  Net Property and Equipment......................................   42,048,520
  Goodwill........................................................   19,700,059
  Other Non-Current Assets........................................    2,657,089
                                                                   ------------
TOTAL ASSETS...................................................... $102,764,477
                                                                   ============
<CAPTION>
               LIABILITIES AND STOCKHOLDERS' EQUITY
               ------------------------------------
<S>                                                                <C>
CURRENT LIABILITIES:
  Current Maturities on Long-Term Debt............................ $     83,328
  Notes Payable...................................................    8,380,000
  Accounts Payable................................................    4,659,643
  Accrued Expenses................................................    6,850,941
                                                                   ------------
Total Current Liabilities.........................................   19,973,912
NON-CURRENT LIABILITIES:
  Deferred Income Taxes...........................................    6,209,001
  Long-Term Debt (Less Current Maturities)........................   36,062,512
  Accrued Pension.................................................    3,304,257
  Other Non-Current Liabilities...................................    2,960,973
                                                                   ------------
Total Non-Current Liabilities.....................................   48,536,743
STOCKHOLDERS' EQUITY:
  Common Shares, $2.50 par value:.................................   14,183,493
  Authorized 12,000,000 shares in 1998 and
   1997. Issued 5,673,397 shares in 1998 and 1997
  Additional Paid-In Capital......................................    1,528,620
  Retained Earnings...............................................   23,430,887
  Treasury Shares (826,216 in 1998
   and 845,016 in 1997), at Cost..................................   (4,734,643)
  Underfunded Pension Liability Adjustment........................     (154,535)
                                                                   ------------
Total Stockholders' Equity........................................   34,253,822
                                                                   ------------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY........................ $102,764,477
                                                                   ============
</TABLE>
 
    See Notes to the Unaudited Condensed Consolidated Financial Statements.
 
                                      F-2
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
 
<TABLE>
<CAPTION>
                                                    THREE MONTHS ENDED MARCH
                                                               31,
                                                    --------------------------
                                                        1998          1997
                                                    ------------  ------------
<S>                                                 <C>           <C>
Net Sales.......................................... $ 30,872,196  $ 20,645,811
Cost of Sales......................................  (21,272,434)  (15,173,396)
                                                    ------------  ------------
  Gross Profit.....................................    9,599,762     5,472,415
Selling and Administrative Expenses................   (4,723,832)   (3,154,306)
Equity in Earnings of Partnership..................          --        255,931
                                                    ------------  ------------
  Operating Earnings...............................    4,875,930     2,574,040
Interest Expense (Net).............................     (775,526)     (370,609)
                                                    ------------  ------------
  Earnings from Continuing Operations
  Before Income Taxes..............................    4,100,404     2,203,431
Provision for Income Taxes--Continuing Operations..   (1,660,487)     (892,441)
                                                    ------------  ------------
  Earnings from Continuing Operations..............    2,439,917     1,310,990
Loss from Discontinued Operations,
  Net of Income Taxes..............................          --       (206,108)
                                                    ------------  ------------
NET EARNINGS....................................... $  2,439,917  $  1,104,882
                                                    ============  ============
BASIC EARNINGS PER SHARE:
  Earnings from Continuing Operations.............. $        .50  $        .27
  Loss from Discontinued Operations................          --           (.04)
                                                    ------------  ------------
  Net Earnings..................................... $        .50  $        .23
                                                    ============  ============
WEIGHTED AVERAGE SHARES OUTSTANDING................    4,835,884     4,788,858
DILUTED EARNINGS PER SHARE:
  Earnings from Continuing Operations.............. $        .48  $        .27
  Loss from Discontinued Operations................          --           (.04)
                                                    ------------  ------------
  Net Earnings..................................... $        .48  $        .23
                                                    ============  ============
WEIGHTED AVERAGE SHARES OUTSTANDING AND
 EQUIVALENTS.......................................    5,041,993     4,868,685
CASH DIVIDENDS DECLARED AND PAID................... $        .08  $        .08
</TABLE>
 
 
    See Notes to the Unaudited Condensed Consolidated Financial Statements.
 
                                      F-3
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
           UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED MARCH
                                                                31,
                                                      -------------------------
                                                          1998         1997
                                                      ------------  -----------
<S>                                                   <C>           <C>
INCREASE (DECREASE) IN CASH
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Earnings........................................  $  2,439,917  $ 1,104,882
Adjustments to Reconcile Net Earnings
 to Net Cash Provided by Operating Activities:
Depreciation........................................     1,309,901      948,201
Goodwill Amortization...............................       160,686        2,500
Increase in Deferred Taxes..........................        60,000       60,000
Change in Assets and Liabilities....................     1,248,609     (663,413)
                                                      ------------  -----------
Total Adjustments to Reconcile
 Net Earnings to Net Cash Provided by Operating
 Activities.........................................     2,779,196      347,288
                                                      ------------  -----------
Net Cash Provided by Operating Activities...........     5,219,113    1,452,170
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital Expenditures................................    (2,315,837)  (1,154,370)
Investment in Acquisitions, Net of Cash Received....   (10,613,703)         --
                                                      ------------  -----------
Net Cash Used in Investing Activities...............   (12,929,540)  (1,154,370)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net Borrowings Under Revolving Credit Agreement.....    10,200,000      300,000
Notes Payable for Purchase of Ticorm................    (1,900,000)         --
Notes Payable for Purchase of Alumatherm............        60,000          --
Dividends Paid......................................      (386,518)    (382,491)
                                                      ------------  -----------
Net Cash Provided by (Used in) Financing Activities.     7,973,482      (82,491)
NET INCREASE IN CASH:...............................       263,055      215,309
Cash at Beginning of Period.........................       283,270       36,228
                                                      ------------  -----------
Cash at End of Period...............................  $    546,325  $   251,537
                                                      ============  ===========
Supplemental Disclosures of Cash Flow Information:
Interest Paid.......................................  $    562,537  $   209,082
Income Taxes Paid--Net of Refunds...................       232,984       99,938
</TABLE>
 
    See Notes to the Unaudited Condensed Consolidated Financial Statements.
 
                                      F-4
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
      NOTES TO THE UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 1. CONDENSED FINANCIAL STATEMENTS
 
  The condensed consolidated financial statements included herein have been
prepared by the Company, without audit, pursuant to the rules and regulations
of the Securities and Exchange Commission. Certain information and footnote
disclosures normally included in financial statements prepared in accordance
with generally accepted accounting principles have been condensed or omitted
pursuant to such rules and regulations, although the Company believes that the
disclosures are adequate to make the information presented not misleading. It
is suggested that these condensed financial statements be read in conjunction
with the consolidated financial statements for the three years ended December
31, 1997, and the notes thereto, appearing elsewhere in this Prospectus.
 
  Statements for the three month periods ended March 31, 1998 and March 31,
1997 reflect, in the opinion of the Company, all adjustments (consisting only
of normal recurring accruals) necessary to present fairly the results of these
periods. Results for interim periods are not necessarily indicative of results
for a full year.
 
NOTE 2. COMPREHENSIVE INCOME
 
  Effective January 1, 1998, the Company adopted SFAS 130, "Reporting
Comprehensive Income." For the first quarters of 1998 and 1997, there was no
difference between net earnings as reported and comprehensive income as per
SFAS 130.
 
NOTE 3. ACQUISITIONS
 
  On January 16, 1998, the Company acquired all of the outstanding shares of
both Industrial Steel Treating Co. ("Industrial") and Fabriform Metal Brazing,
Inc. ("Fabriform"), related heat treating companies in the Los Angeles area,
for $10.6 million. The acquisitions were funded with borrowings under the
revolving credit agreement ("Credit Agreement").
 
  The preliminary allocation of the purchase price of Industrial and Fabriform
included in the Company's financial statements for the first quarter of 1998
is as follows:
 
<TABLE>
<CAPTION>
                                                                 (IN THOUSANDS)
      <S>                                                        <C>
      Property and Equipment....................................    $ 1,952
      Accounts Receivable.......................................      2,018
      Other Assets..............................................        199
      Goodwill..................................................      8,323
      Accounts Payable..........................................       (166)
      Other Liabilities.........................................     (1,713)
                                                                    -------
                                                                    $10,613
</TABLE>
 
  The cost of the acquisitions has been allocated to the assets and
liabilities based on their estimated fair market value. Goodwill is amortized
using the straight line method over 30 years.
 
                                      F-5
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                                 NOTES TO THE
      UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  The purchase agreement with Industrial and Fabriform was effective as of
January 1, 1998. Therefore, the results of Industrial and Fabriform are
included for the entire first quarter of 1998.
 
  The following table presents pro forma information for the first quarter of
1997 of the combined entities of Lindberg Corporation, Industrial and
Fabriform, and Alumatherm Heat Treating Company. The Company purchased the
remaining 50% interest in Alumatherm from its partner on October 1, 1997.
 
  The unaudited pro forma information assumes the acquisitions had taken place
at the beginning of the period presented.
 
<TABLE>
<CAPTION>
                                                   FIRST QUARTER 1997
                                          -------------------------------------
                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
      <S>                                 <C>
      Net Sales..........................                $26,186
      Earnings from Continuing
       Operations........................                  1,687
      Net Earnings.......................                  1,481
      Per Diluted Share:
        Earnings from Continuing
         Operations......................                $   .34
        Net Earnings.....................                    .30
</TABLE>
 
  Adjustments to the statement of earnings include additional depreciation and
interest charges, goodwill amortization, adjustments of certain other expenses
and income tax effects. The pro forma information is provided for illustrative
purposes only and is not necessarily reflective of the future results of the
Company or results of operations that would have actually occurred had the
transactions been in effect for the period presented.
 
NOTE 4. DEBT
 
  On February 10, 1998, the Credit Agreement was amended to increase the
facility by $10 million to $45 million and to adjust certain loan covenants.
Additionally, the amendment extended the maturity date of the Credit Agreement
to April 2000.
 
NOTE 5. MATERIAL CHANGES
 
  The Company is the subject of a pending investigation by the government and
a qui tam (whistle-blower) lawsuit regarding alleged violations of the Federal
False Claims Act. The Company learned of the lawsuit in late May 1998.
Although the activities that are the subject of the investigation and lawsuit
appear to relate to only one plant, no assurance can be given that the
investigation or lawsuit will not materially adversely affect the Company. See
"Business--Litigation." Also, the Company assumed a liability for
environmental remediation, which was estimated to be $1.2 million as of March
31, 1998, in its acquisition of Industrial. Otherwise, no material changes
have occurred with respect to the Company's contingent liabilities outlined in
the Company's financial statements and the notes thereto for the three years
ended December 31, 1997 appearing elsewhere in this Prospectus through the
date of this report.
 
NOTE 6. SUBSEQUENT EVENTS
 
  Subsequent to the end of the first quarter, on April 16, 1998, the Company
acquired all of the outstanding common stock of Houston Heat Treating Company
("HHT") for $10.7 million in cash. The acquisition was funded with additional
borrowings under the Credit Agreement. HHT is a heat treating facility located
in Houston, Texas, specializing in processing for the oilfield equipment
market. On April 24, 1998 the Company's Certificate of Incorporation was
amended to change the par value of the Common Stock to $.01 per share, to
increase the number of authorized shares of Common Stock to 25,000,000 and to
create a new class of 1,000,000 authorized shares of preferred stock, issuable
in series.
 
NOTE 7. DISCONTINUED OPERATIONS
 
  On April 22, 1998, the Company sold certain assets of its Impact Industries,
Inc., a subsidiary operating in the discontinued Precision Products segment,
for cash and a note. On June 11, 1998, the Company sold the assets of Harris
Metals, another Precision Products facility, for cash and a note. The Company
is continuing to pursue the sale of the remaining Precision Products
operations and expects to complete divestiture of the segment by year-end
1998, as originally scheduled.
 
                                      F-6
<PAGE>
 
                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Stockholders of Lindberg Corporation:
 
  We have audited the accompanying consolidated balance sheets of Lindberg
Corporation (a Delaware corporation) and subsidiaries as of December 31, 1997
and 1996, and the related consolidated statements of earnings, stockholders'
equity and cash flows for the years ended December 31, 1997, 1996 and 1995.
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 the audit 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 financial position of Lindberg Corporation and
subsidiaries as of December 31, 1997 and 1996 and the results of its
operations and its cash flows for the years ended December 31, 1997, 1996 and
1995, in conformity with generally accepted accounting principles.
 
Arthur Andersen LLP
 
Chicago, Illinois
January 22, 1998
 
                                      F-7
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                            FOR THE YEARS ENDED DECEMBER 31,
                                            ----------------------------------
                  ASSETS                          1997              1996
                  ------                    ----------------  ----------------
<S>                                         <C>               <C>
CURRENT ASSETS:
Cash......................................  $        283,270  $         36,228
Receivables, Less Allowance for Doubtful
 Accounts of $304,000 in 1997 and $325,000
 in 1996..................................        14,875,005        10,461,635
Prepaid and Refundable Income Taxes.......         1,380,768         1,687,534
Note Receivable...........................               --          1,102,600
Prepaid Expenses..........................           632,846           633,386
Net Assets of Discontinued Operations.....        17,475,866        25,272,160
Other Current Assets......................         1,616,774           371,053
                                            ----------------  ----------------
 Total Current Assets.....................        36,264,529        39,564,596
PROPERTY AND EQUIPMENT:
Land......................................         1,745,246         1,745,246
Buildings and Improvements................        16,674,207        15,663,434
Machinery and Equipment...................        71,363,851        63,135,960
Construction in Progress..................         1,819,101         2,007,217
                                            ----------------  ----------------
 Total Property and Equipment.............        91,602,405        82,551,857
Less Accumulated Depreciation.............       (52,505,822)      (51,673,102)
                                            ----------------  ----------------
 Net Property and Equipment...............        39,096,583        30,878,755
Goodwill..................................        11,537,742           314,738
Investment in Partnership.................               --          1,607,632
Other Non-Current Assets..................         2,664,577         2,521,855
                                            ----------------  ----------------
TOTAL ASSETS..............................  $     89,563,431  $     74,887,576
                                            ================  ================
<CAPTION>
   LIABILITIES AND STOCKHOLDERS' EQUITY
   ------------------------------------
<S>                                         <C>               <C>
CURRENT LIABILITIES:
Current Maturities on Long-Term Debt......  $         83,328  $            --
Notes Payable.............................        10,220,000           901,437
Accounts Payable..........................         3,540,279         3,180,271
Accrued Expenses:
 Salaries and Wages.......................         1,775,352         1,221,914
 Taxes, other than Income.................           543,795           511,213
 Employee Insurance and Benefits..........         1,395,126         1,436,917
 Utilities................................           658,741           593,776
 Other....................................         1,900,780         1,619,272
                                            ----------------  ----------------
 Total Current Liabilities................        20,117,401         9,464,800
NON-CURRENT LIABILITIES:
Deferred Income Taxes.....................         6,149,001         6,847,504
Long-Term Debt (Less Current Maturities)..        25,862,512        20,700,000
Accrued Pension...........................         3,342,458         3,148,114
Other Non-Current Liabilities.............         2,000,641         1,680,256
                                            ----------------  ----------------
 Total Non-Current Liabilities............        37,354,612        32,375,874
STOCKHOLDERS' EQUITY:
Common Shares, $2.50 par value:
 Authorized 12,000,000 shares in 1997 and
 1996;
 Issued 5,673,397 shares in 1997 and 1996.        14,183,493        14,183,493
Additional Paid-In Capital................         1,526,192         1,493,406
Retained Earnings.........................        21,377,489        22,652,574
Treasury Shares (845,016 in 1997 and
 894,256 in 1996), at Cost................        (4,841,221)       (5,054,651)
Underfunded Pension Liability Adjustment..          (154,535)         (227,920)
                                            ----------------  ----------------
 Total Stockholders' Equity...............        32,091,418        33,046,902
                                            ----------------  ----------------
TOTAL LIABILITIES AND STOCKHOLDERS'
 EQUITY...................................  $     89,563,431  $     74,887,576
                                            ================  ================
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                      F-8
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                      CONSOLIDATED STATEMENTS OF EARNINGS
 
<TABLE>
<CAPTION>
                                         FOR THE YEARS ENDED DECEMBER 31,
                                      ----------------------------------------
                                          1997          1996          1995
                                      ------------  ------------  ------------
<S>                                   <C>           <C>           <C>
NET SALES............................ $ 88,783,577  $ 72,776,202  $ 67,967,257
Cost of Sales........................  (63,691,330)  (52,519,365)  (48,702,131)
                                      ------------  ------------  ------------
Gross Profit.........................   25,092,247    20,256,837    19,265,126
Selling and Administrative Expenses..  (13,211,421)  (11,507,041)  (11,530,647)
Equity in Earnings of Partnership....    1,436,328       892,822       301,195
                                      ------------  ------------  ------------
  Operating Earnings.................   13,317,154     9,642,618     8,035,674
Interest Expense (Net)...............   (1,681,103)   (1,511,312)   (1,637,740)
Gain on Asset Conversion.............          --            --        615,242
                                      ------------  ------------  ------------
  Earnings From Continuing Operations
  Before Income Taxes................   11,636,051     8,131,306     7,013,176
Provision for Income Taxes--
 Continuing Operations...............   (4,674,961)   (3,293,032)   (2,840,336)
                                      ------------  ------------  ------------
  Earnings From Continuing
   Operations........................    6,961,090     4,838,274     4,172,840
Discontinued Operations, Net of
 Income Taxes:
Earnings (Loss) From Operations......     (754,240)      178,118     1,461,676
Estimated Loss on Sale...............   (5,944,000)          --            --
                                      ------------  ------------  ------------
  Earnings (Loss) From Discontinued
   Operations........................   (6,698,240)      178,118     1,461,676
                                      ------------  ------------  ------------
NET EARNINGS......................... $    262,850  $  5,016,392  $  5,634,516
                                      ============  ============  ============
BASIC EARNINGS PER SHARE:
Earnings From Continuing Operations.. $       1.45  $       1.01  $        .89
Earnings (Loss) From Discontinued
 Operations..........................        (1.40)          .04           .30
                                      ------------  ------------  ------------
NET EARNINGS......................... $        .05  $       1.05  $       1.19
                                      ============  ============  ============
DILUTED EARNINGS PER SHARE:
Earnings From Continuing Operations.. $       1.41  $        .99  $        .88
Earnings (Loss) From Discontinued
 Operations..........................        (1.36)          .04           .30
                                      ------------  ------------  ------------
NET EARNINGS......................... $        .05  $       1.03  $       1.18
                                      ============  ============  ============
</TABLE>
 
 
                See Notes to Consolidated Financial Statements.
 
                                      F-9
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                           FOR THE YEARS ENDED DECEMBER 31,
                                         --------------------------------------
                                             1997         1996         1995
                                         ------------  -----------  -----------
<S>                                      <C>           <C>          <C>
INCREASE (DECREASE) IN CASH
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Earnings...........................  $    262,850  $ 5,016,392  $ 5,634,516
Adjustments to Reconcile Net Earnings
 to Net Cash Provided by Operating
 Activities:
Depreciation...........................     4,084,315    3,689,743    3,459,246
Equity Earnings, Net of Cash
 Distributions.........................      (235,128)    (692,822)    (301,195)
Goodwill Amortization..................       119,347        5,000          --
Increase (Decrease) in Deferred Taxes..       101,497      732,996     (376,879)
Estimated Loss on Sale of Discontinued
 Operations............................     5,944,000          --           --
Gain on Asset Conversion...............           --           --      (615,242)
Change in Assets and Liabilities:
Receivables............................    (2,337,872)    (165,047)    (788,998)
Prepaid and Refundable Income Taxes....       310,846     (626,989)     966,601
Prepaid Expenses and Other Current
 Assets................................      (220,486)     (12,417)      62,989
Accounts Payable.......................        18,311     (150,594)  (1,741,409)
Accrued Expenses.......................       356,720     (484,785)    (868,754)
Net Assets of Discontinued Operations..     1,052,294     (522,631)  (1,851,911)
Other..................................       698,788   (1,571,556)     319,754
                                         ------------  -----------  -----------
Total Adjustments to Reconcile Net
 Earnings to Net Cash Provided by
 Operating Activities..................     9,892,632      200,898   (1,735,798)
                                         ------------  -----------  -----------
Net Cash Provided by Operating
 Activities............................    10,155,482    5,217,290    3,898,718
                                         ------------  -----------  -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital Expenditures...................    (7,336,401)  (5,365,396)  (4,028,647)
Cash Received for Sale of Alloy Wire
 Belt..................................     1,102,600    1,000,000          --
Investment in Alumatherm, Net of Cash
 Received..............................   (12,757,711)         --           --
Investment in Ticorm, Net of Cash
 Received..............................    (3,797,556)         --           --
Investment in Vac-Hyd..................           --    (2,325,560)         --
Proceeds from Notes Receivable.........           --           --       400,000
                                         ------------  -----------  -----------
Net Cash Used in Investing Activities..   (22,789,068)  (6,690,956)  (3,628,647)
                                         ------------  -----------  -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
Net Borrowings (Payments) Under
 Revolving Credit Agreement............     7,100,000    1,800,000   (2,700,000)
Note Payable for Purchase of Vac-Hyd...      (901,437)     901,437          --
Borrowings Under Senior Note Agreement.           --           --    10,000,000
Payments on Bank Term Loan.............           --           --    (6,300,000)
Notes Payable for Purchase of Ticorm...     1,900,000          --           --
Notes Payable for Purchase of
 Alumatherm............................     6,320,000          --           --
Dividends Paid.........................    (1,537,935)  (1,379,120)  (1,181,054)
                                         ------------  -----------  -----------
  Net Cash Provided by (Used in)
   Financing Activities................    12,880,628    1,322,317     (181,054)
                                         ------------  -----------  -----------
NET INCREASE (DECREASE) IN CASH........       247,042     (151,349)      89,017
Cash at Beginning of Year..............        36,228      187,577       98,560
                                         ------------  -----------  -----------
Cash at End of Year....................  $    283,270  $    36,228  $   187,577
                                         ============  ===========  ===========
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
 INFORMATION:
Interest Paid..........................  $  1,679,402  $ 1,649,277  $ 1,686,270
Income Taxes Paid......................     3,875,117    3,235,993    3,287,073
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                      F-10
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                               UNDERFUNDED
    FOR THE YEARS ENDED                  ADDITIONAL                              PENSION    COMPRE-
DECEMBER 31, 1997, 1996 AND    COMMON     PAID-IN     TREASURY     RETAINED     LIABILITY   HENSIVE
           1995                SHARES     CAPITAL      SHARES      EARNINGS    ADJUSTMENT    INCOME       TOTAL
- ---------------------------  ----------- ----------  -----------  -----------  ----------- ----------  -----------
<S>                          <C>         <C>         <C>          <C>          <C>         <C>         <C>
Balance, December 31, 1994.  $14,183,493 $1,531,600  $(5,405,657) $14,561,840   $(202,760)             $24,668,516
Comprehensive Income:
 Net Earnings..............                                         5,634,516              $5,634,516    5,634,516
 Pension Adjustment........                                                        21,332      21,332       21,332
                                                                                           ----------
   Comprehensive Income....                                                                $5,655,848
                                                                                           ==========
Dividends Paid.............                                        (1,181,054)                          (1,181,054)
Exercise of Stock Options..                 (19,494)      58,619                                            39,125
                             ----------- ----------  -----------  -----------   ---------              -----------
Balance, December 31, 1995.   14,183,493  1,512,106   (5,347,038)  19,015,302    (181,428)              29,182,435
Comprehensive Income:
 Net Earnings..............                                         5,016,392              $5,016,392    5,016,392
 Pension Adjustment........                                                       (46,492)    (46,492)     (46,492)
                                                                                           ----------
   Comprehensive Income....                                                                $4,969,900
                                                                                           ==========
Dividends Paid.............                                        (1,379,120)                          (1,379,120)
Exercise of Stock Options..                 (18,700)     292,387                                           273,687
                             ----------- ----------  -----------  -----------   ---------              -----------
Balance, December 31, 1996.   14,183,493  1,493,406   (5,054,651)  22,652,574    (227,920)              33,046,902
Comprehensive Income:
 Net Earnings..............                                           262,850              $  262,850      262,850
 Pension Adjustment........                                                        73,385      73,385       73,385
                                                                                           ----------
   Comprehensive Income....                                                                $  336,235
                                                                                           ==========
Dividends Paid.............                                        (1,537,935)                          (1,537,935)
Exercise of Stock Options..                  32,786      213,430                                           246,216
                             ----------- ----------  -----------  -----------   ---------              -----------
Balance, December 31, 1997.  $14,183,493 $1,526,192  $(4,841,221) $21,377,489   $(154,535)             $32,091,418
                             =========== ==========  ===========  ===========   =========              ===========
</TABLE>
 
 
                See Notes to Consolidated Financial Statements.
 
                                      F-11
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
             FOR THE YEARS ENDED DECEMBER 31, 1997, 1996 AND 1995
 
NOTE 1. ACCOUNTING POLICIES
 
  A. Nature of Operations. The Company serves metal-using and metal-working
industries, providing commercial metal heat treating.
 
  B. Principles of Consolidation. The consolidated financial statements
include the accounts of Lindberg Corporation and its subsidiaries. Significant
intercompany balances and transactions have been eliminated.
 
  The Company's 50% share of a heat treating partnership was carried at cost
plus equity in undistributed earnings from the partnership formation on July
1, 1994, until the acquisition of that entity on October 1, 1997 (see Note
(2)).
 
  C. Revenue Recognition. The Company recognizes revenues from sales upon
shipment to its customers.
 
  D. Property and Depreciation. Property and equipment are stated at cost.
Depreciation is provided on the straight line method for financial statement
purposes and on accelerated methods for income tax purposes. Maintenance costs
are charged to expense as incurred. Expenditures which improve efficiency or
capacity or extend the useful life of assets are capitalized. Interest cost
incurred during the period of construction of plant and equipment is
capitalized as part of the cost of such plant and equipment.
 
  E. Income Taxes. The Company determines its tax provision and deferred tax
balance in compliance with SFAS 109, "Accounting for Income Taxes". Under this
approach, the provision for income taxes represents income taxes paid or
payable for the current year adjusted for the change in deferred taxes during
the year. Deferred income taxes reflect the net tax effects of temporary
differences between the financial statement bases and the tax bases of assets
and liabilities and are adjusted for changes in tax rates and tax laws when
changes are enacted.
 
  F. Earnings Per Share. Effective January 1, 1997, the Company adopted SFAS
128, "Earnings per Share" (SFAS 128). The provisions of SFAS 128 require
computations of basic and diluted earnings per share. Diluted earnings per
share reflect the potential dilution that could occur if outstanding stock
options were converted into common stock. Dilutive shares used in the
calculations for the years ended December 31, 1997, 1996 and 1995 were
4,932,828, 4,860,555, and 4,763,491, respectively. Basic earnings per share
excludes dilution effects. Earnings per share for all years have been computed
in accordance with SFAS 128.
 
  G. Use of Estimates. The preparation of these financial statements, in
conformity with generally accepted accounting principles, required the use of
certain estimates by management in determining the Company's assets,
liabilities, revenues and expenses. Actual results could differ from those
estimates.
 
  H. Impairment of Long-Lived Assets. Effective January 1, 1996, the Company
adopted SFAS 121, "Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to be Disposed Of" (SFAS 121). The provisions of SFAS 121
require a review of long-lived assets for impairment whenever events or
changes in circumstances indicate that the carrying amount of an asset may not
be recoverable. The Company does not believe that any impairment of long-lived
assets has occurred, and, therefore, the adoption of SFAS 121 did not have any
effect on the Company's statements of earnings in 1997 or 1996.
 
  I. Reclassifications. Certain prior period amounts have been reclassified to
be consistent with the 1997 presentation.
 
NOTE 2. ACQUISITIONS
 
  On May 31, 1996, the Company acquired the assets of Vac-Hyd for $1.4 million
of cash and a note payable of $.9 million. On July 31, 1997, the Company
acquired all of the outstanding shares of Ticorm, Inc. for $1.9
 
                                     F-12
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
million of cash and $1.9 million of notes payable. On October 1, 1997, the
Company acquired the remaining 50% share of its joint venture partnership--
Alumatherm Heat Treating Company ("Alumatherm")--from its partner for $6.5
million of cash and $6.3 million of notes payable. Each of these acquired
businesses is a heat treating company in the Los Angeles area. Cash payments
made as part of each purchase were funded with additional borrowings under the
Company's revolving credit agreement.
 
  Prior to the purchase of Alumatherm, the Company reported its results under
the equity method of accounting as an unconsolidated partnership. Accordingly,
the Company's statements of earnings for the years ended December 31, 1996 and
1995 and for the nine months ended September 30, 1997, include the Company's
equity in Alumatherm's earnings. The Company's investment in Alumatherm was
included in Total Assets for the year ended December 31, 1996; subsequent to
the purchase, the financial position for Alumatherm was included in the
Company's balance sheet on a fully consolidated basis.
 
  All of the acquisitions were accounted for using the purchase method;
accordingly, the results of operations have been included in the consolidated
totals of the Company since the dates of their respective acquisitions. The
cost of the acquisitions has been allocated to the assets and liabilities
based on their estimated fair market value. Goodwill is amortized using the
straight line method over 30 years.
 
  With the exception of Alumatherm, the acquired companies did not materially
impact the consolidated financial position or results of operations for the
periods presented. The preliminary allocation of the total cost of Alumatherm,
which includes the purchase price and the elimination of the related equity
investment account, is as follows:
 
<TABLE>
<CAPTION>
                                                                   ALUMATHERM
                                                                 --------------
                                                                 (IN THOUSANDS)
      <S>                                                        <C>
      Property and Equipment....................................    $ 3,575
      Accounts Receivable.......................................      1,921
      Goodwill..................................................      9,873
      Other Assets..............................................        237
      Accounts Payable..........................................       (281)
      Other Liabilities.........................................       (722)
                                                                    -------
                                                                    $14,603
                                                                    =======
</TABLE>
 
  The following table presents pro forma information for the combined entities
of Lindberg Corporation and Alumatherm for the twelve months ended December
31, 1997 and 1996 assuming the acquisition had taken place at the beginning of
the periods presented.
 
<TABLE>
<CAPTION>
                                                 1997               1996
                                          ------------------ ------------------
                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
      <S>                                 <C>                <C>
      Unaudited
        Net Sales........................ $           98,962 $           81,806
        Earnings from Continuing
         Operations......................              7,831              5,181
        Net Earnings.....................              1,133              5,359
        Per Diluted Share:
          Earnings from Continuing
           Operations.................... $             1.59 $             1.07
          Net Earnings...................                .23               1.10
</TABLE>
 
  Adjustments to the statements of earnings include additional depreciation
and interest charges, goodwill amortization, the reduction of certain other
expenses and income tax effects. The pro forma information is provided for
illustrative purposes only and is not necessarily reflective of the future
results of the Company or results of operations that would have actually
occurred had the transaction been in effect for the periods presented.
 
                                     F-13
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
NOTE 3. DISCONTINUED OPERATIONS
 
  On December 22, 1997, the Board of Directors approved a plan to sell the
Company's Precision Products business segment ("Precision Products"). Although
difficult to predict, the Company expects to sell the segment during 1998.
Precision Products is reported as discontinued operations, and the
consolidated financial statements have been reclassified to segregate the net
assets and operating results of the business. The Precision Products segment
consists of two aluminum die casting facilities (Impact Industries, Inc. and
Arrow-Acme Company) and one aluminum semi-permanent mold foundry (Harris
Metals).
 
  The estimated loss recorded during 1997 for the sale of Precision Products
was $6.7 million, which included a reduction in asset values of $5.8 million
and a provision for anticipated closing costs and operating losses until
disposal of $.9 million. The loss was reported net of an income tax benefit of
$.8 million, for an after-tax loss of $5.9 million.
 
  The loss on the sale of Precision Products was based on estimates of the
proceeds expected to be realized on the sale of the operations. The amounts
the Company will ultimately realize could differ materially from the amounts
assumed in arriving at the loss on disposal of the discontinued operations.
Summary operating results of the discontinued operations for 1997, 1996 and
1995 are as follows:
 
<TABLE>
<CAPTION>
                                                        1997     1996    1995
                                                       -------  ------- -------
                                                           (IN THOUSANDS)
      <S>                                              <C>      <C>     <C>
      Net sales....................................... $34,567  $41,244 $54,037
      Costs and expenses..............................  35,835   40,945  51,580
                                                       -------  ------- -------
      Earnings (loss) before taxes....................  (1,268)     299   2,457
      Provision (benefit) for income taxes............    (514)     121     995
                                                       -------  ------- -------
      Net income (loss)............................... $  (754) $   178 $ 1,462
                                                       =======  ======= =======
</TABLE>
 
  At December 31, 1997, net assets of the discontinued operations of
approximately $17.5 million consisted of $7.4 million of net current assets,
$14.2 million of equipment and $2.6 million of other net assets, less the
allowance for the estimated loss on disposal.
 
NOTE 4. INCOME TAXES
 
  The major components of the provision for income taxes for 1997, 1996 and
1995 are as follows:
 
<TABLE>
<CAPTION>
                                                         CURRENT DEFERRED TOTAL
                                                         ------- -------- ------
                                                             (IN THOUSANDS)
      <S>                                                <C>     <C>      <C>
      1997
        Federal......................................... $3,448    $269   $3,717
        State...........................................    800      51      851
        Canadian........................................    107     --       107
                                                         ------    ----   ------
                                                         $4,355    $320   $4,675
                                                         ======    ====   ======
      1996
        Federal......................................... $2,142    $386   $2,528
        State...........................................    620      74      694
        Canadian........................................     54      17       71
                                                         ------    ----   ------
                                                         $2,816    $477   $3,293
                                                         ======    ====   ======
      1995
        Federal......................................... $1,852    $211   $2,063
        State...........................................    737      40      777
                                                         ------    ----   ------
                                                         $2,589    $251   $2,840
                                                         ======    ====   ======
</TABLE>
 
 
                                     F-14
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The provision for income taxes includes deferred tax expense (benefit)
resulting from timing differences in the recognition of revenue and expense
for tax and financial statement purposes. The sources of these differences and
the tax effect of each are as follows:
 
<TABLE>
<CAPTION>
                                                               1997  1996 1995
                                                               ----  ---- -----
                                                               (IN THOUSANDS)
      <S>                                                      <C>   <C>  <C>
      Depreciation............................................ $158  $137 $  88
      Restructuring Activities................................  --    --    385
      Environmental Control Activities........................  (49)  241  (370)
      Other...................................................  211    99   148
                                                               ----  ---- -----
                                                               $320  $477 $ 251
                                                               ====  ==== =====
</TABLE>
 
  The differences between the provision for income taxes at the statutory rate
and that shown in the consolidated statements of earnings are summarized as
follows:
 
<TABLE>
<CAPTION>
                                                            1997   1996   1995
                                                           ------ ------ ------
                                                              (IN THOUSANDS)
      <S>                                                  <C>    <C>    <C>
      Consolidated Pretax Earnings at Statutory Rate...... $3,956 $2,765 $2,384
      State Income Taxes, Net of Federal Tax Benefit......    614    429    370
      Other...............................................    105     99     86
                                                           ------ ------ ------
                                                           $4,675 $3,293 $2,840
                                                           ====== ====== ======
</TABLE>
 
  Significant components of the Company's deferred tax liabilities and assets
at December 31, 1997, and 1996 are as follows:
 
<TABLE>
<CAPTION>
                                                                1997     1996
                                                               -------  -------
                                                               (IN THOUSANDS)
      <S>                                                      <C>      <C>
      Deferred Tax Liabilities:
      Tax Depreciation Over Book.............................  $(6,104) $(7,452)
      Reserve for Discontinued Operations....................     (840)     --
      Other Liabilities......................................     (482)    (398)
                                                               -------  -------
       Total Deferred Tax Liabilities........................  $(7,426) $(7,850)
                                                               =======  =======
      Deferred Tax Assets:
      Reserves Not Deducted for Tax..........................  $   761  $   829
      Employee Benefit Provisions in Excess of Cash Payments.    1,221    1,266
      Other Assets...........................................      148      324
                                                               -------  -------
       Total Deferred Tax Assets.............................  $ 2,130  $ 2,419
                                                               -------  -------
       Net Deferred Tax Liability............................  $(5,296) $(5,431)
                                                               =======  =======
      Included in Balance Sheet in:
      Prepaid and Refundable Income Taxes....................  $   853  $ 1,417
      Deferred Income Taxes..................................   (6,149)  (6,848)
                                                               -------  -------
                                                               $(5,296) $(5,431)
                                                               =======  =======
</TABLE>
 
                                     F-15
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
NOTE 5. DEBT
 
  Long-term debt consists of the following:
 
<TABLE>
<CAPTION>
                                                                1997     1996
                                                               -------  -------
                                                               (IN THOUSANDS)
      <S>                                                      <C>      <C>
      Senior Notes............................................ $10,000  $10,000
      Revolving Credit........................................  17,800   10,700
      Notes Payable...........................................   8,366      901
                                                               -------  -------
                                                                36,166   21,601
      Less-Current Maturities................................. (10,303)    (901)
                                                               -------  -------
                                                               $25,863  $20,700
                                                               =======  =======
</TABLE>
 
  In April 1994, the Company entered into an unsecured revolving credit
agreement (the "Agreement") with two banks which provided for a line of credit
of $20,000,000 and a term loan of $7,000,000.
 
  In November 1995, the Company refinanced its debt. Ten million dollars of
senior notes were issued, the proceeds of which were used to retire the
outstanding balance of the Company's term loan and a portion of the
outstanding balance on its revolving credit facility. The notes bear interest
at 7.16% annually and have a seven-year final maturity. Equal annual principal
payments on the notes commence on the third anniversary of closing and
continue on each anniversary date through the life of the notes. In
conjunction with the refinancing, the Company and its banks amended the
Agreement to allow for the issuance of the senior notes and to terminate the
term loan.
 
  In February 1996, the Agreement was amended to increase the total facility
by $5 million to $25 million. The total facility was further increased by $10
million to $35 million in September 1997 and amended in February 1998 to
increase the facility $10 million to $45 million. Additionally, the February
1998 amendment extended the maturity date of the Agreement to April 2000.
 
  The Company may choose from two interest rate alternatives (i) the bank's
reference rate (prime rate) and (ii) a Eurodollar loan rate plus an applicable
margin based on the Company's ratio of funded debt to earnings before
interest, taxes, depreciation and amortization. The effective interest rates
for the Agreement were 6.6% and 6.7% during 1997 and 1996, respectively; the
year-end rates were 6.7% and 6.5% for 1997 and 1996, respectively.
 
  The revolving credit and senior note agreements contain various covenants
which, among others, restrict the ability of the Company to pay dividends
beyond certain limits and require the Company to meet certain financial
ratios. In February 1998, certain covenants in the Agreement and in the senior
notes were modified.
 
  The Company also has a second agreement which provides for the issuance of
letters of credit, up to a maximum of $5,000,000. At December 31, 1997, a
letter of credit totaling $4,500,000 was issued in accordance with an
insurance agreement.
 
  Annual maturities of long-term debt, excluding the revolving credit
agreement, for the five years following December 31, 1997 are $10,303,000,
$2,063,000, $2,000,000, $2,000,000 and $2,000,000, respectively.
 
NOTE 6. LEASES
 
  The Company has a number of lease agreements related to the rental of
production and administrative facilities and equipment. These are of varying
terms and extend as far as the year 2007.
 
 
                                     F-16
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The following is a schedule of estimated future minimum rental payments
required under leases that have initial or remaining noncancelable terms in
excess of one year as of December 31, 1997:
 
<TABLE>
<CAPTION>
                                                                OPERATING LEASES
                                                                ----------------
                                                                 (IN THOUSANDS)
      <S>                                                       <C>
      1998.....................................................      $1,703
      1999.....................................................       1,635
      2000.....................................................       1,174
      2001.....................................................         882
      2002.....................................................         709
      Thereafter...............................................       1,220
                                                                     ------
          Total minimum payment required.......................      $7,323
                                                                     ======
</TABLE>
 
  The total rent expense for 1997, 1996 and 1995 was $1,765,000, $1,412,000,
and $1,086,000, respectively.
 
  No sublease income is due after 1997.
 
NOTE 7. EMPLOYEE BENEFITS
 
  The Company and its subsidiaries have various defined benefit pension plans
covering many of their employees. The pension expense related to these plans
for 1997, 1996 and 1995 was $391,000, $455,000, and $31,000, respectively,
which included amortization of past service cost over 30 years. The standards
utilized by the Company to fund the pension plans satisfy the minimum funding
requirements under the provisions of ERISA.
 
  Net periodic pension cost for 1997, 1996 and 1995 included the following
components:
 
<TABLE>
<CAPTION>
                                                     1997     1996     1995
                                                    -------  -------  -------
                                                        (IN THOUSANDS)
      <S>                                           <C>      <C>      <C>
      Service Cost--Benefits Earned During the
       Period...................................... $   727  $   776  $   533
      Interest Cost on Projected Benefit
       Obligations.................................   1,226    1,158    1,076
      Return on Plan Assets........................  (3,760)  (2,436)  (3,194)
      Net Amortization and Deferral................   2,198      957    1,616
                                                    -------  -------  -------
                                                       $391  $   455  $    31
                                                    =======  =======  =======
</TABLE>
 
                                     F-17
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  Table 1 summarizes the funded status of the plans and provides a
reconciliation to the long-term pension liability recorded on the Company's
consolidated balance sheets at December 31, 1997 and 1996.
 
                   TABLE 1: RECONCILIATION OF FUNDED STATUS
                                (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                          ASSETS EXCEED  ACCUMULATED  ASSETS EXCEED  ACCUMULATED
                           ACCUMULATED    BENEFITS     ACCUMULATED    BENEFITS
                            BENEFITS    EXCEED ASSETS   BENEFITS    EXCEED ASSETS
                              1997          1997          1996          1996
                          ------------- ------------- ------------- -------------
<S>                       <C>           <C>           <C>           <C>
Actuarial Present Value
 of Benefit
 Obligations:
Vested Benefit
 Obligations............    $(11,834)      $(1,345)     $(10,807)      $(1,805)
Accumulated Benefit
 Obligations............     (12,375)       (1,535)      (11,295)       (2,028)
Projected Benefit
 Obligations............     (15,969)       (1,787)      (14,593)       (2,255)
Plan Assets at Fair
 Value..................      20,796           383        17,592           714
                            --------       -------      --------       -------
Plan Assets in Excess of
 (or less than)
 Projected Benefit
 Obligations............       4,827        (1,404)        2,999        (1,541)
Unrecognized Net (Gain)
 Loss...................      (4,647)          519        (2,452)          619
Unrecognized Net
 (Assets) Obligations
 Amortized over Average
 Remaining
 Service Period of the
 Employee
 Workforce..............        (919)           73        (1,100)          109
Unrecognized Prior
 Service Cost...........         195           191           269           238
Long-Term Balance Sheet
 Liability..............         --           (531)          --           (738)
                            --------       -------      --------       -------
Long-Term Pension
 Liability..............    $   (544)      $(1,152)     $   (284)      $(1,313)
                            ========       =======      ========       =======
</TABLE>
 
 
  The discount rate used in determining the projected benefit obligation was
7.50% in 1997 and 1996. The rate of increase in future compensation levels and
the expected long-term rate of return on assets were 5.0% and 9.0%,
respectively, in both 1997 and 1996.
 
  The Company and its subsidiaries also have various defined contribution
plans. The Company matches 50% of the participants' contributions up to 4% of
compensation. Additionally, the Company also contributes one percent of each
employee's compensation for all employees who are not participants in a
defined benefit plan, have six months of service, and who are still
participants in the 401(k) savings plan at the end of the year. The Company
made distributions for contributions and related expenses of $598,000,
$544,000, and $499,000 to these defined contribution plans in 1997, 1996 and
1995, respectively.
 
  The Company provides no other postretirement benefits other than the benefit
plans listed above.
 
NOTE 8. STOCK OPTIONS
 
  In 1991, the Board of Directors and stockholders approved a stock option
plan for key employees. The plan provides for the issuance, from time to time,
of options to purchase shares of the Company's common stock at prices not less
than 100% of the fair market value of the stock at the time an option is
granted. In 1995, the plan was amended to increase the reserve of common stock
available for issuance upon the exercise of options to
 
                                     F-18
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
675,000 shares. The following table summarizes information as to options
granted, exercised, cancelled and outstanding under this plan and options
still available under a similar plan which expired in 1991.
 
<TABLE>
<CAPTION>
                                                                 AVERAGE OPTION
                                                        SHARES   PRICE PER SHARE
                                                        -------  ---------------
      <S>                                               <C>      <C>
      Outstanding, December 31, 1994................... 318,400       $6.20
      Options exercised during year.................... (10,375)       3.77
      Options cancelled during year....................  (1,250)       4.63
                                                        -------       -----
        Outstanding, December 31, 1995................. 306,775        6.29
      Options granted during year......................  72,900        7.50
      Options exercised during year.................... (51,750)       5.29
      Options cancelled during year....................  (9,700)       7.30
                                                        -------       -----
        Outstanding, December 31, 1996................. 318,225        6.70
      Options granted during year......................  73,900        9.00
      Options exercised during year.................... (56,125)       6.26
      Options cancelled during year.................... (26,300)       7.52
                                                        -------       -----
        Outstanding, December 31, 1997................. 309,700       $7.26
                                                        =======       =====
</TABLE>
 
  The Company adopted the disclosure-only option under SFAS 123, "Accounting
for Stock Based Compensation" (SFAS 123), as of December 31, 1996. As such,
the Company continues to account for employee stock options under APB Opinion
25, as permitted under generally accepted accounting principles. Accordingly,
no compensation cost has been recognized in the accompanying financial
statements related to these options. Had compensation cost for these plans
been determined consistent with SFAS 123, the Company's net earnings and net
earnings per share would have been the following:
 
<TABLE>
<CAPTION>
                                               1997               1996
                                        ------------------ ------------------
                                        (IN THOUSANDS, EXCEPT PER SHARE DATA)
      <S>                               <C>                <C>
      Earnings From Continuing
       Operations
        As reported.................... $            6,961 $            4,838
        Pro forma......................              6,796              4,745
      Net Earnings
        As reported....................                263              5,016
        Pro forma......................                165              4,961
      Diluted Earnings Per Share:
      Earnings From Continuing
       Operations
        As reported.................... $             1.41 $              .99
        Pro forma......................               1.38                .98
      Net Earnings
        As reported....................                .05               1.03
        Pro forma......................                .03               1.02
</TABLE>
 
  Since SFAS 123 does not apply to options granted prior to January 1, 1995,
the pro forma disclosure is not likely to be indicative of pro forma results
which may be expected in future years.
 
  The fair values of the option grants are estimated at the date of grant
using the Black-Scholes option pricing model with the following weighted-
average assumptions for 1997 and 1996, respectively: risk-free interest rates
of 5.7% and 6.5%; dividend yields of 2.1% and 3.2%; volatility of 40.1% and
46.0%; and an average expected life of 5 years for both 1997 and 1996. The
options vest ratably over 4 years. The fair value of options granted during
1997 and 1996 were calculated to be $3.29 and $2.83, respectively.
 
                                     F-19
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
  In 1991, the stockholders approved a stock option plan for members of the
Board of Directors who are not employees of the Company, covering a maximum of
72,000 shares. In 1997, this plan was amended to increase the reserve of
common stock available for issuance upon the exercise of options to 150,000
shares and to remove the termination date of the plan, among other changes.
Under the terms of this plan, options to purchase an aggregate of 75,000
shares have been granted. The average exercise price for these options is
$7.74 per share. At December 31, 1997, 75,000 shares were available for future
grant.
 
NOTE 9. RELATED PARTY
 
  The Company holds an 18% equity interest in Thixomat, Inc., a Company formed
to promote and commercialize Thixomolding(TM) technology. The Chairman of
Thixomat serves on the Board of Directors of Lindberg, and is also the
President and Chief Executive Officer of University Science Partners, Inc.,
which holds a 40% equity interest in Thixomat. In addition, Lindberg holds a
seat on Thixomat's Board of Directors. At December 31, 1997, the Company held
a $434,000 equity investment in Thixomat.
 
NOTE 10. COMMITMENTS AND CONTINGENCIES
 
  The Company is a party to various lawsuits and claims arising in the
ordinary course of business. Management, after review and consultation with
legal counsel, considers that any liability resulting from these matters would
not materially affect the financial condition or results of operations of the
Company.
 
  The Company employs some environmentally hazardous materials. The Company
has made expenditures to comply with laws and regulations relating to the
protection of the environment, including studies, investigations and
remediation of ground contamination, and expects to make such expenditures in
the future in its efforts to comply with existing and future requirements.
While such expenditures to date have not materially affected the Company's
capital expenditures, competitive position, financial condition, or results of
operations, there can be no assurance that more stringent regulation or
enforcement in the future will not have such effects.
 
  In some cases, the Company has notified state authorities of a possible need
for remediation at sites it previously operated, or currently operates. At all
such sites, costs which may be incurred are difficult to predict accurately
until the level of contamination is determined, and would be subject to
increase if more contamination is discovered during investigation or
remediation or if state authorities require more remediation than anticipated.
Such costs may be less if the contamination proves to be less than currently
expected, and to the extent costs are covered by insurance or are allocable to
others.
 
  The Company has also been notified by various state and federal governmental
authorities that they believe it may be a "potentially responsible party" or
otherwise have responsibility with respect to clean-up obligations at three
waste disposal sites which were never owned or operated by the Company. The
Company is participating in negotiations for settlement with the relevant
authorities or other parties believed by the Company to be responsible for
clean-up obligations and further believes its responsibility to be of a minor
nature. Management believes that the ultimate outcome will not have a material
effect on the Company's financial condition or results of operations.
 
  At December 31, 1997, the Company had reserves of approximately $900,000 to
cover future anticipated costs. The Company has estimated a range of costs in
establishing these reserves. Such reserves give no effect to possible
recoveries from insurers or other potentially responsible parties nor do they
reflect any discount for the several years over which investigation or
remediation amounts may be paid out.
 
                                     F-20
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
NOTE 11. QUARTERLY FINANCIAL DATA (UNAUDITED)
 
  Summarized quarterly financial data for 1997 and 1996 are shown in Table 2.
 
                 TABLE 2: QUARTERLY FINANCIAL DATA (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                  QUARTER ENDED
                                    MARCH 31  JUNE 30  SEPTEMBER 30 DECEMBER 31
                                    --------  -------  ------------ -----------
                                       (IN THOUSANDS EXCEPT FOR PER SHARE
                                                    AMOUNTS)
<S>                                 <C>       <C>      <C>          <C>
1997
Net Sales.......................... $20,646   $20,750    $20,955        $26,433
Gross Profit.......................   5,472     5,777      5,381          8,462
Earnings From Continuing
 Operations........................   1,311     1,822      1,547          2,281
Loss From Discontinued Operations..    (206)      (15)      (200)        (6,277)
                                    -------   -------    -------        -------
  NET EARNINGS (LOSS).............. $ 1,105   $ 1,807    $ 1,347        $(3,996)
                                    =======   =======    =======        =======
Basic Earnings Per Share:
Earnings From Continuing
 Operations........................ $   .27   $   .38    $   .32        $   .47
Loss From Discontinued Operations..    (.04)      --        (.04)         (1.30)
                                    -------   -------    -------        -------
  NET EARNINGS (LOSS).............. $   .23   $   .38    $   .28        $  (.83)
                                    =======   =======    =======        =======
Diluted Earnings Per Share:
Earnings From Continuing
 Operations........................ $   .27   $   .37    $   .31        $   .46
Loss From Discontinued Operations..    (.04)      --        (.04)         (1.25)
                                    -------   -------    -------        -------
  NET EARNINGS (LOSS).............. $   .23   $   .37    $   .27        $  (.79)
                                    =======   =======    =======        =======
1996
Net Sales.......................... $17,742   $18,374    $18,262        $18,398
Gross Profit.......................   4,664     5,209      4,903          5,481
Earnings From Continuing
 Operations........................     925     1,185      1,050          1,678
Earnings (Loss) From Discontinued
 Operations........................     318       285         19           (444)
                                    -------   -------    -------        -------
  NET EARNINGS..................... $ 1,243   $ 1,470    $ 1,069        $ 1,234
                                    =======   =======    =======        =======
Basic Earnings Per Share:
Earnings From Continuing
 Operations........................ $   .20   $   .25    $   .22        $   .35
Earnings (Loss) From Discontinued
 Operations........................     .07       .06        --            (.09)
                                    -------   -------    -------        -------
  NET EARNINGS..................... $   .27   $   .31    $   .22        $   .26
                                    =======   =======    =======        =======
Diluted Earnings Per Share:
Earnings From Continuing
 Operations........................ $   .19   $   .24    $   .22        $   .34
Earnings (Loss) From Discontinued
 Operations........................     .07       .06        --            (.09)
                                    -------   -------    -------        -------
  NET EARNINGS..................... $   .26   $   .30    $   .22        $   .25
                                    =======   =======    =======        =======
</TABLE>
 
  The quarter ended December 31, 1997 includes a net charge of $5,944,000
related to the discontinuance of the Company's Precision Products segment.
 
                                     F-21
<PAGE>
 
                     LINDBERG CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
NOTE 12. STOCKHOLDER RIGHTS PLAN
 
  In 1996, the Company declared a dividend distribution of one common share
purchase right on each outstanding share of common stock. The rights become
exercisable after a person or group acquires beneficial ownership of 20% or
more of the common stock of the Company or publicly announces a tender offer
or exchange offer for 20% or more of the common stock. Initially, each right
will entitle its holder to buy one share of common stock of the Company at an
exercise price of $40 per share. If a person or group acquires beneficial
ownership of 20% or more of the outstanding common stock of the Company: 1.)
each right will entitle its holder to purchase shares of common stock of the
Company at one-half their market price, or, in certain circumstances, at their
par value (currently $2.50 per share) and 2.) if the Company or its assets are
acquired in certain merger or other transactions, holders of rights may
acquire common stock of the acquiring Company having a market value of twice
the exercise price of the right. Rights held by the 20% holder will become
void and will not be exercisable to purchase shares at the reduced purchase
price. The rights, which do not have voting rights, will expire on November
21, 2006 and may be redeemed by the Company's board of directors at a price of
$.01 per right prior to their expiration or the accumulation of 20% or more of
the Company's common stock.
 
NOTE 13. SUBSEQUENT EVENT
 
  On January 16, 1998, the Company acquired all of the outstanding shares of
both Industrial Steel Treating Co. and Fabriform Metal Brazing, Inc., heat
treating companies in the Los Angeles area, for $11 million. The acquisitions
were funded with borrowings under the revolving credit agreement.
 
                                     F-22
<PAGE>
 
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 NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY IN-
FORMATION OR TO MAKE ANY REPRESENTATION OTHER THAN THOSE CONTAINED OR INCORPO-
RATED BY REFERENCE IN THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION
OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE
COMPANY OR THE UNDERWRITERS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO
SELL OR A SOLICITATION OF AN OFFER TO BUY THE SHARES BY ANYONE IN ANY JURISDIC-
TION IN WHICH SUCH OFFER OR SOLICITATION WOULD BE UNLAWFUL OR TO ANY PERSON TO
WHOM IT IS UNLAWFUL. UNDER NO CIRCUMSTANCES SHALL THE DELIVERY OF THIS PROSPEC-
TUS OR ANY SALE MADE PURSUANT TO THIS PROSPECTUS CREATE ANY IMPLICATION THAT
INFORMATION CONTAINED OR INCORPORATED BY REFERENCE IN THIS PROSPECTUS IS COR-
RECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF THIS PROSPECTUS.
 
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                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Prospectus Summary........................................................   3
Statement Concerning Forward-Looking Statements...........................   7
Risk Factors..............................................................   7
Use of Proceeds...........................................................  10
Price Range of the Common Stock; Dividend Policy..........................  11
Capitalization............................................................  12
Selected Consolidated Financial Data......................................  13
Management's Discussion and Analysis of Results of Operations and
 Financial Condition......................................................  14
Business..................................................................  19
Management................................................................  28
Principal Stockholders....................................................  30
Description of Capital Stock..............................................  32
Underwriting..............................................................  34
Legal Matters.............................................................  35
Experts...................................................................  35
Available Information.....................................................  35
Incorporation of Certain Documents by Reference...........................  36
Index to Financial Statements............................................. F-1
</TABLE>
 
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                                1,000,000 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
 
 
                                   PROSPECTUS
 
 
                             ABN AMRO INCORPORATED
 
                               MCDONALD & COMPANY
                                SECURITIES, INC.
 
                                 JULY 28, 1998
 
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