VICTOR EQUIPMENT CO
POS AM, 1999-04-14
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 14, 1999
    
 
   
                                                      REGISTRATION NO. 333-57457
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             Washington, D.C. 20549
                             ---------------------
                                 POST EFFECTIVE
   
                                AMENDMENT NO. 1
    
                                       TO
                                    FORM S-1
                                       ON
                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
   
                              THERMADYNE MFG. LLC
    
   
           (Exact Name of Co-Registrant as Specified in Its Charter)
    
 
   
<TABLE>
<S>                             <C>                             <C>
           DELAWARE                          3548                         74-2878452
 (State or Other Jurisdiction    (Primary Standard Industrial          (I.R.S. Employer
              of                 Classification Code Number)         Identification No.)
Incorporation or Organization)
</TABLE>
    
 
   
                            THERMADYNE CAPITAL CORP.
    
 
   
           (Exact Name of Co-Registrant as Specified in Its Charter)
    
   
          (and Certain Subsidiaries Identified in Footnote (1) Below)
    
 
   
<TABLE>
<S>                             <C>                             <C>
           DELAWARE                          3548                         74-2878453
 (State or Other Jurisdiction    (Primary Standard Industrial          (I.R.S. Employer
              of                 Classification Code Number)         Identification No.)
Incorporation or Organization)
</TABLE>
    
 
   
<TABLE>
<S>                                                          <C>
                                                                         RANDALL E. CURRAN
             101 SOUTH HANLEY ROAD, SUITE 300                     101 SOUTH HANLEY ROAD, SUITE 300
                 ST. LOUIS, MISSOURI 63105                           ST. LOUIS, MISSOURI 63105
                      (314) 721-5573                                       (314) 721-5573
                                                              (Name, Address, Including Zip Code, and
    (Address, Including Zip Code, and Telephone Number,                      Telephone
                         Including                           Number, Including Area Code, of Agent For
 Area Code of Co-Registrants' Principal Executive Offices)                    Service)
</TABLE>
    
 
   
                                    Copy to:
    
 
                                 R. SCOTT COHEN
                           WEIL, GOTSHAL & MANGES LLP
                         100 CRESCENT COURT, SUITE 1300
                              DALLAS, TEXAS 75201
 
   
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effectiveness of this Post-Effective Amendment.
    
   
    If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]
    
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [X]
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
   
(1) The following direct and indirect subsidiaries of Thermadyne Mfg. LLC are
    Co-Registrants (the "Guarantors"), each of which is incorporated in the
    state and has the I.R.S. Employer Identification Number indicated: C&G
    Systems Holding, Inc., a Delaware corporation (43-1704862), C&G Systems,
    Inc., an Illinois corporation (36-3923822), Coyne Natural Gas Systems Inc.,
    a Missouri corporation (43-1476849), Marison Cylinder Company, a Delaware
    corporation (37-1258890), MECO Holding Company, a Delaware corporation
    (43-1691576), Modern Engineering Company, Inc., a Missouri corporation
    (43-0418190), Stoody Company, a Delaware corporation (31-1525264), Tag
    Realty, Inc., a Texas corporation (75-2450351), Thermadyne Cylinder Company,
    a California corporation (94-167459), Thermadyne Industries, Inc., a
    Delaware corporation (94-2697077), Thermadyne International Corp., a
    Delaware corporation (94-2655752), Thermal Arc, Inc., a Delaware corporation
    (43-1789286), Thermal Dynamics Corp., a Delaware corporation (94-2452212),
    Tweco Products, Inc., a Delaware corporation (94-2725575), Victor Coyne
    International, Inc., a Delaware corporation (94-2159326), Victor Equipment
    Company, a Delaware corporation (94-0955680), Wichita Warehouse Corporation,
    a Kansas corporation (43-1683218), and Woodland Cryogenics Company, a
    Delaware corporation (52-2061312).
    
   
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
   
                                EXPLANATORY NOTE
    
 
   
This Registration Statement covers the registration of an aggregate principal
amount at maturity of $207,000,000 of 9 7/8% Senior Subordinated Notes due 2008
of Thermadyne Mfg. LLC and Thermadyne Capital Corp. for resale by Donaldson,
Lufkin & Jenrette Securities Corporation in market-making transactions.
    
<PAGE>   3
 
PROSPECTUS
 
   
                                  $207,000,000
    
 
   
                              Thermadyne Mfg. LLC
    
   
                            Thermadyne Capital Corp.
    
 
   
                   9 7/8% Senior Subordinated Notes due 2008
    
 
- - OFFERING PRICE
   
  The notes will be offered at negotiated prices, which will relate to
  prevailing market prices at the time of sale.
    
 
- - INTEREST
   
  We will pay cash interest on the notes at a rate of 9 7/8% per year on June 1
  and December 1.
    
 
- - MATURITY
   
  The notes will mature on June 1, 2008.
    
 
- - REDEMPTION
   
  We may redeem all or some of the notes at any time on or after June 1, 2003,
  in cash at the redemption prices described in this prospectus, plus accrued
  and unpaid interest and liquidated damages, if any.
    
 
- - RANKING
   
  The notes will rank junior to all of our current and future senior
  indebtedness, will rank equally with all of our future senior subordinated
  indebtedness and will be senior to all of our future subordinated
  indebtedness.
    
 
   
- - GUARANTEE
    
   
  The notes are guaranteed by most of our domestic subsidiaries on a senior
  subordinated basis.
    
 
   
- - MARKET FOR THE NOTES
    
   
  The notes are not listed on any securities exchange or quoted through any
  automated quotation system, and no active public market for the notes is
  anticipated.
    
 
   
For a more detailed description of the notes, see "Description of the Notes"
beginning on page 13.
    
 
   
INVESTING IN THE NOTES INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON PAGE 4.
    
 
Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or has passed upon
the adequacy or accuracy of this prospectus. Any representation to the contrary
is a criminal offense.
 
   
This prospectus will be used by Donaldson, Lufkin & Jenrette Securities
Corporation for offers and sales in market-making transactions at negotiated
prices, which relate to prevailing market prices at the time of the sale.
Donaldson, Lufkin & Jenrette intends to make a market in the notes, however it
is not obligated to do so and any market-making may be discontinued at any time.
We will not receive any of the proceeds from the sale of the notes but we will
incur expenses related to their registration.
    
 
                          DONALDSON, LUFKIN & JENRETTE
 
   
April   , 1999
    
<PAGE>   4
 
                                    SUMMARY
 
   
This brief summary highlights selected information from the prospectus. It does
not contain all of the information that is important to you. We urge you to read
the entire prospectus and the other documents to which it refers to fully
understand the terms of the notes.
    
 
                                  THE COMPANY
 
OVERVIEW
 
   
Thermadyne Mfg., a wholly-owned subsidiary of Thermadyne Holdings Corporation,
is a leading global manufacturer of cutting and welding products and
accessories. We manufacture a broad range of gas (oxy-fuel) and electric arc
cutting and welding products that are ultimately sold to end-user customers who
are principally engaged in the following industries:
    
 
     - aerospace,
 
     - automotive,
 
     - construction,
 
     - metal fabrication,
 
     - mining,
 
     - mill and foundry,
 
     - petroleum, and
 
     - shipbuilding.
 
   
Thermadyne Capital is a wholly-owned subsidiary of Thermadyne Mfg. Thermadyne
Capital has no assets, no liabilities, other than the notes and no substantial
operations.
    
 
Our mailing address and telephone number are as follows:
 
101 South Hanley Road, Suite 300
St. Louis, Missouri 63105
(314) 721-5573
 
   
                                   THE NOTES
    
 
   
The summary below describes the principal terms of the notes. This summary is
not intended to be complete. We urge you to read the complete description of the
notes shown in the section entitled "Description of the Notes" beginning on page
13.
    
 
   
Issuers......................   The notes are joint and several obligations of
                                Thermadyne Mfg. and Thermadyne Capital. For
                                purposes of this prospectus, Thermadyne Mfg. and
                                Thermadyne Capital are sometimes referred to as
                                the "Issuers."
    
 
   
Securities Offered...........   $207 million aggregate principal amount at
                                maturity of 9 7/8% Senior Subordinated Notes due
                                2008.
    
                                        1
<PAGE>   5
 
Maturity Date................   June 1, 2008.
 
   
Interest Payment Dates.......   June 1 and December 1.
    
 
   
Optional Redemption..........   We may redeem all or a portion of the notes at
                                any time on or after June 1, 2003 in cash at the
                                redemption prices shown in this prospectus, plus
                                accrued and unpaid interest and liquidated
                                damages, if any, to the applicable redemption
                                date. In addition, at any time before June 1,
                                2003, we may, upon the occurrence of a change of
                                control of our Company, redeem all but not some
                                of the notes, at a cash price equal to:
    
 
   
                                - the present value of the sum of all the
                                  remaining premium and principal payments that
                                  would become due on the notes as if the notes
                                  were to remain outstanding and be redeemed on
                                  June 1, 2003, computed using a discount rate
                                  equal to the Treasury Rate, as that term is
                                  defined on page 18, plus 50 basis points, plus
    
 
   
                                - accrued and unpaid interest and liquidated
                                  damages, if any, to the date of redemption.
    
 
   
Optional Redemption after
  Public Equity Offerings....   On or before June 1, 2001, we may redeem the
                                notes at a cash price of 109.875% of the
                                aggregate principal amount of the notes, plus
                                liquidated damages, if any, to the redemption
                                date, with the net cash proceeds of one or more
                                public equity offerings, as that term is defined
                                on page 49. If we redeem less than 100% of the
                                then outstanding notes, at least 65% of the
                                aggregate principal amount of notes must remain
                                outstanding immediately after any redemption of
                                this type.
    
 
   
Change of Control............   Upon the occurrence of a change of control of
                                our Company, you will have the right to require
                                us to repurchase all or any part of your notes
                                at a cash price equal to 101% of the aggregate
                                principal amount of the notes plus accrued and
                                unpaid interest and any liquidated damages.
    
 
   
                                We cannot assure you that we will have enough
                                money to repurchase the notes following a change
                                of control of our Company.
    
 
   
Ranking......................   The notes are senior subordinated obligations
                                and will be junior in right of payment to all of
                                our existing and future senior indebtedness,
                                including indebtedness under our credit
                                facility. The notes will rank equal in right of
                                payment with all of our future senior
                                subordinated indebtedness and will rank senior
                                in right of payment to all of our future
                                indebtedness that is
    
                                        2
<PAGE>   6
 
   
                                subordinate to the notes. The notes will be
                                subordinate to all liabilities of our
                                subsidiaries.
    
 
   
Note Guarantees..............   The notes are unconditionally guaranteed on a
                                senior subordinated basis by most of our
                                domestic subsidiaries. The note guarantees are
                                general unsecured obligations of the guarantors,
                                junior in right of payment to all existing and
                                future senior indebtedness of the guarantors,
                                including under our credit facility, and rank
                                senior in right of payment to any future
                                subordinated indebtedness of the guarantors.
    
 
   
Certain Indenture
Provisions...................   The indenture governing the notes contains
                                certain covenants that limit our ability and
                                most of our subsidiaries' ability to:
    
 
   
                                - incur indebtedness and issue preferred stock,
    
 
   
                                - repurchase our capital stock and certain
                                  indebtedness,
    
 
   
                                - enter into transactions with affiliates,
    
 
   
                                - enter into sale and leaseback transactions,
    
 
   
                                - incur or allow the existence of certain liens,
    
 
   
                                - pay dividends or make other distributions,
    
 
   
                                - make certain investments,
    
 
   
                                - sell assets, and
    
 
                                - merge or consolidate with another company.
 
                                USE OF PROCEEDS
 
   
This prospectus is being delivered to you in connection with the sale of the
notes by Donaldson, Lufkin & Jenrette Securities Corporation in market-making
transactions. We will not receive any of the proceeds from the sale.
    
 
                                  RISK FACTORS
 
   
We urge you to carefully review the Risk Factors beginning on page 4 for a
discussion of factors you should consider in evaluating an investment in the
notes.
    
                                        3
<PAGE>   7
 
                                  RISK FACTORS
 
   
In addition to the other information contained in this prospectus, you should
carefully consider the following information about our business before making an
investment in the notes.
    
 
YOU SHOULD NOT PLACE UNDUE RELIANCE ON ANY OF OUR FORWARD-LOOKING STATEMENTS.
 
This prospectus contains certain forward-looking statements about our financial
condition, results of operations and business. You can identify many of these
statements by looking for words such as "believes," "expects," "may," "will,"
"should," "seeks," "pro forma," "anticipates" or "intends" or the negative of
any of these words, or any other similar words, or by discussions of strategy or
intentions.
 
   
These forward-looking statements are subject to numerous assumptions, risks and
uncertainties. Factors which may cause our actual results, performance or
achievements, to be materially different from any future results, performance or
achievements expressed or implied by us in those statements include the
following:
    
 
     - the competitive nature of the cutting and welding industry in general as
       well as our specific market areas;
 
     - changes in prevailing interest rates and the availability of and terms of
       financing to fund the anticipated growth of our business;
 
     - inflation;
 
     - changes in costs of goods and services;
 
     - economic conditions in general as well as in our specific market areas;
 
     - changes in or our failure to comply with federal, state and/or local
       government regulations;
 
     - liability and other claims asserted against us;
 
     - changes in our operating strategy or development plans;
 
     - our ability to attract and retain qualified personnel;
 
     - our ability to pay interest and principal on a very large amount of debt;
 
     - labor disturbances;
 
     - changes in our acquisition and capital expenditure plans; and
 
     - any other factors described in this prospectus.
 
Because these statements are necessarily dependent upon assumptions, estimates
and dates that may be incorrect or imprecise and involve known and unknown
risks, uncertainties and other factors, you should not consider any of the
forward-looking statements included in this prospectus to be predictions of
future events. Given these uncertainties, you are cautioned not to place undue
reliance on any forward-looking statements. We do not undertake any
responsibility to update you on the occurrence of any unanticipated events or to
publicly announce the results of any revisions to any of the forward-looking
statements contained in this prospectus to reflect future events or
developments.
 
                                        4
<PAGE>   8
 
   
WE HAVE A SUBSTANTIAL AMOUNT OF DEBT, WHICH COULD ADVERSELY AFFECT OUR FINANCIAL
CONDITION AND RESULTS OF OPERATIONS AND PREVENT US FROM FULFILLING OUR
OBLIGATIONS UNDER THESE NOTES.
    
 
   
We have a large amount of consolidated indebtedness when compared to the
consolidated equity of our stockholders. As of December 31, 1998, we had
outstanding consolidated indebtedness of approximately $571.8 million, $77.4
million of additional borrowings available under our credit facility and a
stockholder's deficit of $383.9 million. The terms of our credit facility, the
indenture relating to the notes and the indenture related to the outstanding
12 1/2% senior discount debentures of Thermadyne Holdings limit, but do not
prohibit, the incurrence of additional indebtedness by us.
    
 
   
Such a large amount of indebtedness could have negative consequences for us,
including the following:
    
 
     - our cash flow available for general corporate purposes, including
       acquisitions, could be limited because a substantial portion of our cash
       flow from operations is used to pay our debt;
 
     - our ability to obtain financing in the future for working capital,
       capital expenditures or acquisitions could be limited;
 
     - our flexibility in reacting to competitive and other changes in the
       industry and economic conditions generally could be limited; and
 
     - some of our borrowings are at variable rates of interest, which may make
       us vulnerable to increases in interest rates.
 
OUR ABILITY TO GENERATE SIGNIFICANT CASH FLOW REQUIRED TO SERVICE OUR
INDEBTEDNESS DEPENDS ON MANY FACTORS BEYOND OUR CONTROL.
 
   
Our ability to make scheduled payments of principal of, to pay interest on or to
refinance our indebtedness and to satisfy our other debt obligations depends
upon our future operating performance, which will be affected by general
economic, financial, competitive, legislative, regulatory, business and other
factors beyond our control. We anticipate that our operating cash flow, together
with borrowings under the credit facility, will be sufficient to meet our
anticipated future operating expenses, capital expenditures and to pay our debt
as it becomes due. However, if our future operating cash flows are less than
currently anticipated we may be forced, in order to meet our debt service
obligations, to reduce or delay acquisitions or capital expenditures, sell
assets or reduce operating expenses, including investment spending such as
selling and marketing expenses, expenditures on management information systems
and expenditures on new products. If we were unable to meet our debt service
obligations, we could attempt to restructure or refinance our indebtedness or to
seek additional equity capital. We cannot guarantee that we will be able to do
any of the foregoing on satisfactory terms, if at all.
    
 
   
WE ARE RESTRICTED BY THE TERMS OF THE INDENTURE THAT GOVERNS THE NOTES.
    
 
   
The indenture restricts, among other things, our ability to:
    
 
   
     - incur additional indebtedness,
    
 
   
     - incur liens,
    
 
   
     - pay dividends or make certain other restricted payments,
    
 
   
     - enter into certain transactions with affiliates,
    
 
                                        5
<PAGE>   9
 
   
     - impose restrictions on the ability of a restricted subsidiary to pay
       dividends or make certain payments to Thermadyne Holdings,
    
 
   
     - merge or consolidate with any other person, or
    
 
   
     - sell, assign, transfer, lease, convey or otherwise dispose of all or
       substantially all of our assets.
    
 
   
In addition, the credit facility contains other and more restrictive covenants
and prohibits us from prepaying our other indebtedness, including the notes. The
credit facility requires us to maintain specified financial ratios and satisfy
certain other financial condition tests. Our ability to meet those financial
ratios and tests can be affected by events beyond our control, and there can be
no assurance that we will meet those tests. A breach of any of these covenants
could result in a default under the credit facility and/or the notes. Upon the
occurrence of an event of default under the credit facility, the lenders could
elect to declare all amounts outstanding under the credit facility to be
immediately due and payable. If we were unable to repay those amounts, the
lenders could proceed against the collateral granted to them to secure that
indebtedness. If the lenders under the credit facility accelerate, there can be
no assurance that our assets would be sufficient to repay in full such
indebtedness and our other indebtedness, including the notes. Substantially all
of Thermadyne Holdings' domestic assets are pledged as security under the credit
facility.
    
 
   
THE NOTES ARE SUBORDINATED TO ALL SENIOR INDEBTEDNESS AND CERTAIN OF OUR ASSETS
ARE ENCUMBERED.
    
 
   
The notes will be our general unsecured obligations and will be subordinated in
right of payment to all of our existing and future senior indebtedness,
including all indebtedness under the credit facility. In addition, the note
guarantee of each guarantor will be subordinated to the prior payment in full of
all senior indebtedness of such guarantor, including such guarantor's guarantee
of the credit facility, to the same extent that the notes are subordinated to
our senior indebtedness. As of December 31, 1998, Thermadyne Holdings and the
guarantors had outstanding approximately $329.0 million of senior indebtedness,
all of which was secured borrowings, and approximately $77.4 million of
additional revolving borrowings available under the credit facility. By reason
of such subordination, in the event of our insolvency, liquidation,
reorganization, dissolution or other winding-up or the guarantors or upon a
default in payment with respect to, or the acceleration of, any senior
indebtedness, the holders of such senior indebtedness and any other creditors
who are holders of senior indebtedness and creditors of subsidiaries, if any,
must be paid in full before the holders of the notes may be paid. If we or the
guarantors incur any additional debt that ranks equally with the notes, the
holders of such debt would be entitled to share ratably with the holders of the
notes in any proceeds distributed in connection with any insolvency,
liquidation, reorganization, dissolution or other winding-up of our companies or
the guarantors. This may have the effect of reducing the amount of proceeds paid
to holders of the notes.
    
 
   
In addition, no cash payments may be made with respect to the notes during the
continuance of a payment default with respect to senior indebtedness and, under
certain circumstances, for a period of up to 179 days if a non-payment default
exists with respect to senior indebtedness. In addition, holders of indebtedness
and other liabilities of our subsidiaries that are not guarantors will have
claims that are effectively senior to the notes. As of December 31, 1998, our
non-guarantor subsidiaries had approximately $127.3 million
    
 
                                        6
<PAGE>   10
 
   
of outstanding liabilities, including trade payables. See "Description of the
Notes -- Subordination."
    
 
   
WE ARE DEPENDENT ON OUR SUBSIDIARIES DUE TO OUR HOLDING COMPANY STRUCTURE.
    
 
   
Thermadyne Mfg. is a holding company, and as such, is dependent upon the receipt
of dividends from its direct and indirect subsidiaries in order to meet its debt
service obligations. Subject to the provisions of the indenture, future
borrowings by our subsidiaries may contain restrictions or prohibitions on the
payment of dividends by such subsidiaries. See "Description of the
Notes -- Certain Covenants." In addition, under applicable state law, our
subsidiaries may be limited in the amount that they are permitted to pay as
dividends on their capital stock.
    
 
WE MAY NOT HAVE THE ABILITY TO RAISE THE FUNDS NECESSARY TO FINANCE THE CHANGE
OF CONTROL OFFER REQUIRED BY THE INDENTURE.
 
   
If there is a change of control of our Company, you will have the right to
require us to repurchase all or any part of your notes at a cash price equal to
101% of the aggregate principal amount of the notes, plus accrued and unpaid
interest and liquidated damages, if any, on the notes to the date of repurchase.
We cannot guarantee that we will have enough money to repurchase the notes if a
change of control occurs.
    
 
   
The credit facility prohibits us from purchasing the notes, except in certain
limited amounts, and also provides that certain change of control events with
respect to us will constitute a default under the credit facility. Any future
credit agreements or other agreements relating to senior indebtedness to which
we become a party may contain similar restrictions and provisions. If a change
of control occurs at a time when we are prohibited from purchasing the notes, we
could seek the consent of our lenders to the purchase of the notes or could
attempt to refinance the borrowings that contain such prohibition. If we do not
obtain such consent or repay such borrowings, we will remain prohibited from
purchasing the notes. In such case, our failure to purchase the tendered notes
would constitute an event of default under the indenture which would, in turn,
constitute a default under the credit facility and could constitute a default
under other senior indebtedness. In such circumstances, the subordination
provisions in the indenture would likely restrict payments to the holders of the
notes. See "Description of the Notes -- Subordination."
    
 
   
CERTAIN AFFILIATED FUNDS AND ENTITIES OF DONALDSON, LUFKIN & JENRETTE ARE
THERMADYNE HOLDINGS' PRINCIPAL STOCKHOLDERS AND EXERCISE CONTROL OVER US.
    
 
   
Approximately 82.5% of the outstanding shares of Thermadyne Holdings' common
stock is held by affiliated funds and entities of DLJ Merchant Banking Partners
II, L.P. As a result of their stock ownership, these funds control Thermadyne
Holdings, and through Thermadyne Holdings, our companies, have the power to
elect a majority of its directors, appoint new management and approve any action
requiring the approval of the holders of Thermadyne Holdings' common stock. This
includes adopting certain amendments to our certificate of incorporation and
approving mergers or sales of all or substantially all of our assets. The
directors elected by the funds will have the authority to make decisions that
affect our capital structure, including the issuance of additional capital
stock, the implementation of stock repurchase programs and the declaration of
dividends. Your interests may differ from the interests of the funds and other
entities affiliated with Donaldson, Lufkin & Jenrette.
    
 
                                        7
<PAGE>   11
 
   
The general partners of each of the funds are affiliates or employees of
Donaldson, Lufkin & Jenrette, Inc. DLJ Capital Funding, which acted as
syndication agent for the credit facility, is also an affiliate of Donaldson,
Lufkin & Jenrette, Inc. Donaldson, Lufkin & Jenrette Securities Corporation,
which placed the notes and the senior discount debentures of Thermadyne
Holdings, is also an affiliate of Donaldson, Lufkin & Jenrette, Inc.
    
 
   
Having a controlling stockholder is likely to make it more difficult for a third
party to acquire, or to discourage a third party from seeking to acquire, a
majority of Thermadyne Holdings' outstanding common stock. A third party would
be required to negotiate any of these transactions with the funds and the
interests of the funds may be different from yours.
    
 
   
WE MAY NOT BE ABLE TO CONTINUE OUR AGGRESSIVE ACQUISITION STRATEGY.
    
 
   
We have historically pursued an aggressive acquisition strategy. We have
completed ten acquisitions from September 13, 1994 to December 31, 1998, and we
expect to continue to pursue this strategy to promote our growth. There are
various risks associated with pursuing a growth strategy of this nature. For
example:
    
 
   
     - any future growth will require us to manage our expanding domestic and
       international operations, integrate new businesses and adapt our
       operational and financial systems to respond to changes in our business
       environment, while maintaining a competitive cost structure;
    
 
   
     - this acquisition strategy will continue to place significant demands on
       us and our management to improve our operational, financial and
       management information systems, to develop further the skills of our
       managers and supervisors, and to continue to retain, train, motivate and
       effectively manage our employees;
    
 
   
     - our failure to manage our prior or future growth effectively could have a
       material adverse effect on us; and
    
 
   
     - we cannot guarantee that suitable acquisition candidates will be
       available or that acquisitions can be completed on reasonable terms.
    
 
   
Additionally, our ability to maintain and increase our revenue base and to
respond to shifts in customer demand and changes in industry trends will be
partially dependent on our ability to generate enough cash flow or obtain enough
capital for the purpose of, among other things, financing acquisitions,
satisfying customer contractual requirements and financing infrastructure
growth. We cannot guarantee that we will be able to generate sufficient cash
flow or that financing will be available on acceptable terms, if at all, or will
be permitted under the terms of the credit facility or notes indenture and any
future indebtedness, to fund our future growth.
    
 
BECAUSE OUR INDUSTRY IS CYCLICAL IN NATURE, WE MAY BE ADVERSELY AFFECTED BY
CYCLICAL DOWNTURNS IN THE INDUSTRY.
 
The cutting and welding industry in the United States is a mature industry that
is cyclical in nature. The substitution of plastic, concrete and other materials
impacts the use of fabricated metal parts in many products and structures.
Increased offshore manufacturing by United States companies has contributed to
slow growth rates in the domestic manufacturing industry and in turn has led to
slower growth in the United States cutting and welding industry. During periods
of economic expansion the cutting and welding
 
                                        8
<PAGE>   12
 
   
industry has grown at double digit rates but has experienced contraction during
periods of slowing industrial activity. We cannot guarantee that during future
periods of economic expansion the cutting and welding industry will experience
the same growth rates as it has in the past. Although we believe that our
exposure to cyclical downturns is moderated by our broad customer base and the
diversity of the industries we serve, cyclical downturns could have an adverse
effect on our period-to-period results.
    
 
INVESTING IN INTERNATIONAL MARKETS PRESENTS MANY RISKS.
 
   
Our growth strategy includes increasing the marketing of our existing products
into Europe, Asia, Latin America and other developing economies. However, we
cannot assure you that we will be successful in our expansion efforts.
    
 
   
Approximately 37% of our net sales in 1998, including our United States third
party export sales, were made to purchasers located in foreign countries.
Because of our foreign operations, our business is subject to the currency risks
of doing business abroad, including exchange rate fluctuations and limits on the
repatriation of funds.
    
 
   
Additionally, as a result of the current downturn in the Asian economy, there
may be a decrease in infrastructure development in the Asian region or an
overall worldwide contraction of industrial development. The impact of decreased
development could have a material adverse effect on our business, financial
condition or results of operations.
    
 
   
Further, many developing economies have a significant degree of political and
economic uncertainty. Social unrest, the absence of trained labor pools and the
uncertainty of entering into joint ventures or other partnership arrangements
with local organizations have slowed business activities in some large
developing economies. The political and economic uncertainties present in these
promising growth markets may adversely impact our ability to implement and
achieve our foreign growth objectives.
    
 
OUR INDUSTRY IS HIGHLY COMPETITIVE.
 
The cutting and welding industry is highly competitive. While we believe we are
one of only a few worldwide broad line manufacturers of both cutting and welding
equipment and consumable products, we compete in each of our businesses with
other broad line manufacturers and numerous smaller competitors that specialize
in particular products.
 
   
Although we have historically experienced little direct foreign competition in
the United States, fluctuations in the value of the United States dollar against
other currencies could make the United States market more attractive to foreign
exporters.
    
 
We currently experience substantial competition in the foreign markets in which
we compete.
 
   
WE MAY INCUR ENVIRONMENTAL LIABILITY WHICH COULD HAVE A MATERIAL ADVERSE EFFECT
ON OUR OPERATIONS.
    
 
Our operations are subject to federal, state, local and foreign laws and
regulations relating to the storage, handling, generation, treatment, emission,
release, discharge and disposal of certain substances and wastes. As a result,
we are occasionally involved in administrative or legal proceedings relating to
environmental matters and have in the past and will continue in the future to
incur capital costs and other expenditures relating to environmental matters.
Liability under environmental laws may be imposed on current and prior owners
and operators of property or businesses without regard to fault or to knowledge
about the condition or action causing the liability. We may be required to incur
 
                                        9
<PAGE>   13
 
   
costs relating to the remediation of properties, including properties at which
we dispose of waste. Environmental conditions could also lead to claims for
personal injury, property damage or damages to natural resources. We are aware
of environmental conditions at certain properties which we now or previously
owned or leased that are undergoing remediation and we have in the past and may
in the future be named a potentially responsible party at off-site disposal
sites where we have sent waste.
    
 
   
We believe, based on current information, that any costs we may incur relating
to environmental matters will not have a material adverse effect on our
business, financial condition or our result of operations. We cannot guarantee,
however, that we will not incur significant fines, penalties or other
liabilities associated with noncompliance or clean-up liabilities or that future
events, such as changes in laws or the interpretation of those laws, the
development of new facts or the failure of other potentially responsible parties
to pay their share of remediation costs will not cause us to incur additional
costs that could have a material adverse effect on our business, financial
condition or results of operations.
    
 
   
YOU CANNOT BE SURE THAT AN ACTIVE TRADING MARKET WILL DEVELOP FOR THE NOTES.
    
 
   
There is no existing trading market for the notes and we cannot guarantee that
there will be a market at any time in the future. We also cannot assure you that
you will be able to sell your notes. If a market were to develop, the notes
could trade at prices that may be higher or lower than their initial offering
price depending upon many factors, including:
    
 
     - prevailing interest rates;
 
     - our operating results; and
 
     - the market for similar securities.
 
   
Although not obligated to do so, Donaldson, Lufkin & Jenrette Securities
Corporation intends to make a market in the notes. This market-making activity
may be discontinued at any time, for any reason, without notice at the sole
discretion of Donaldson, Lufkin & Jenrette Securities Corporation.
    
 
OUR BUSINESS AND OUR SUPPLIERS' BUSINESSES ARE HIGHLY DEPENDENT ON COMPUTER
SYSTEMS. ANY COMPUTER PROBLEMS DUE TO THE YEAR 2000 MAY ADVERSELY AFFECT OUR
BUSINESS.
 
   
An issue exists for all companies that rely on computers as the year 2000
approaches. The "Year 2000" problem is the result of the past practice in the
computer industry of using two digits rather than four to define the applicable
year. This practice could result in incorrect results when computers perform
arithmetic operations, comparisons or data field sorting involving years later
than 1999. As a result, any of our computer programs that have time-sensitive
software may recognize a date using "00" as the year 1900 rather than the year
2000. This could result in a system failure or miscalculations causing
disruptions of operations, including, among other things, a temporary inability
to process transactions, send invoices, or engage in similar normal business
activities. We believe that our internal systems are Year 2000 compliant or will
be upgraded or replaced in connection with previously planned changes to
information systems before the need to comply with Year 2000 requirements.
However, we are uncertain as to the extent our customers and vendors may be
affected by Year 2000 issues that require commitment of significant resources
and may cause disruptions in our customers' and our vendors' businesses.
    
 
                                       10
<PAGE>   14
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
   
The following table sets forth the historical ratios of earnings to fixed
charges of Thermadyne Mfg. and Thermadyne Capital. For purposes of this
computation, "earnings" consist of income (loss) before income taxes plus fixed
charges. "Fixed charges" consist of interest, amortization of deferred financing
costs and one-third of the rent expense from our operating leases, which we
believe is a reasonable approximation of the interest component of rent expense.
Earnings were not sufficient to cover fixed charges by $80.8 million, $123.3
million, $63.5 million and $25.1 million for the fiscal years ended December 31,
1994, 1995, 1996 and 1998, respectively.
    
 
   
<TABLE>
<CAPTION>
            YEAR ENDED DECEMBER 31,
- ------------------------------------------------
        1998           1997   1996   1995   1994
        ----           ----   ----   ----   ----
                  (UNAUDITED)
<S>                    <C>    <C>    <C>    <C>
         --            1.6x     --     --     --
</TABLE>
    
 
                                USE OF PROCEEDS
 
   
This prospectus is being delivered in connection with the sale of notes by
Donaldson, Lufkin & Jenrette Securities Corporation in market-making
transactions. We will not receive any of the proceeds from the sale of the
notes.
    
 
                                       11
<PAGE>   15
 
                              PLAN OF DISTRIBUTION
 
   
This prospectus will be used by Donaldson, Lufkin & Jenrette Securities
Corporation ("DLJSC") in connection with offers and sales of the notes in
market-making transactions effected from time to time. DLJSC may act as a
principal or agent in these transactions, including as agent for the
counterparty when acting as principal or as agent for both counterparties, and
may receive compensation in the form of discounts and commissions, including
from both counterparties when it acts as agent for both. Such sales will be made
at prevailing market prices at the time of sale, at prices related thereto or at
negotiated prices.
    
 
   
DLJ Merchant Banking Partners II, L.P. ("DLJMB"), an affiliate of DLJSC, and
certain of its affiliates beneficially own approximately 82.5% of the common
stock of Thermadyne Holdings. Peter T. Grauer, a principal of DLJMB, is a member
of the Board of Directors of Thermadyne Mfg., Thermadyne Capital and Thermadyne
Holdings; William F. Dawson, Jr., a principal of DLJMB, is a member of the Board
of Directors of Thermadyne Mfg., Thermadyne Capital and Thermadyne Holdings; and
Lawrence M.v.D. Schloss, a principal of DLJMB, is a member of the Board of
Directors of Thermadyne Holdings. DLJSC has informed Thermadyne Holdings that it
does not intend to confirm sales of the notes to any accounts over which it
exercises discretionary authority without the prior specific written approval of
such transactions by the customer.
    
 
   
The Issuers have been advised by DLJSC that, subject to applicable laws and
regulations, DLJSC, as the initial purchaser of the notes, currently intends to
make a market in the notes. However, DLJSC is not obligated to do so and any
such market-making may be interrupted or discontinued at any time without
notice. In addition, this market-making activity will be subject to the limits
imposed by the Securities Act of 1933 and the Securities Exchange Act of 1934.
There can be no assurance that an active trading market will develop or be
sustained. See "Risk Factors."
    
 
   
DLJSC has, from time to time, provided investment banking and other financial
advisory services to Thermadyne Holdings in the past for which they have
received customary compensation, including fees received in connection with the
offering of the notes, and may provide such services and financial advisory
services to Thermadyne Holdings in the future. DLJSC acted as purchasers in
connection with the initial sale of the notes and the senior discount debentures
of Thermadyne Holdings for which it received an underwriting discount of
approximately $9 million.
    
 
   
The Issuers have entered into a Registration Rights Agreement with DLJSC with
respect to its use of this prospectus. Pursuant to this agreement, the Issuers
have agreed to bear all registration expenses incurred under this agreement, and
have agreed to indemnify DLJSC against certain liabilities under the Securities
Act.
    
 
                                       12
<PAGE>   16
 
   
                            DESCRIPTION OF THE NOTES
    
 
GENERAL
 
   
The 9 7/8% Senior Subordinated Notes due 2008 (the "Notes") were issued pursuant
to an Indenture (the "Indenture") among Thermadyne Mfg. LLC and Thermadyne
Capital Corp., as issuers, and State Street Bank and Trust Company, as trustee
(the "Trustee"). The terms of the Notes include those stated in the Indenture
and those made part of the Indenture by reference to the Trust Indenture Act of
1939, as amended (the "Trust Indenture Act"). The Notes are subject to all of
these terms, and holders of Notes are referred to the Indenture and the Trust
Indenture Act for a statement of the terms. A copy of the Indenture has been
filed as an exhibit to the Registration Statement of which this Prospectus is a
part and the summary in this section of certain provisions of the Indenture and
the Trust Indenture Act does not purport to be complete and is qualified in its
entirety by reference to the Indenture and the Indenture Act. The definitions of
certain terms used in the following summary are shown below under the caption
"--Certain Definitions."
    
 
   
The Notes are general unsecured obligations of the Issuers and are subordinated
in right of payment to all existing and future Senior Indebtedness of the
Issuers, including borrowings under the New Credit Facility. The Notes will rank
pari passu with any future senior subordinated Indebtedness of the Issuers and
will rank senior in right of payment to all future subordinated Indebtedness of
the Issuers. The Notes are effectively subordinated to all liabilities of the
Issuers' subsidiaries that are not Guarantors. The Notes are unconditionally
guaranteed on a senior subordinated basis by certain of Thermadyne Mfg.'s (the
"Company") existing domestic subsidiaries. The Note Guarantees are general
unsecured obligations of the Guarantors, will be subordinated in right of
payment to all existing and future Senior Indebtedness of the Guarantors,
including indebtedness under the New Credit Facility, and will rank senior in
right of payment to any future subordinated indebtedness of the Guarantors. The
Indenture permits the Company and its Subsidiaries to incur additional
Indebtedness, including Senior Indebtedness, in the future. See "Risk Factors"
and "--Certain Covenants--Incurrence of Indebtedness and Issuance of Preferred
Stock."
    
 
   
Thermadyne Capital, a wholly-owned subsidiary of the Company incorporated in
Delaware, was formed for the purpose of serving as a co-issuer of the Notes in
order to facilitate the Original Offerings. The Company believes that certain
prospective purchasers of the Notes may be restricted in their ability to
purchase debt securities of limited liability companies, such as the Company,
unless these debt securities are jointly issued by a corporation. Thermadyne
Capital will not have any substantial operations or assets and will not have any
revenues. As a result, prospective purchasers of the Notes should not expect
Thermadyne Capital to participate in servicing the interest and principal
obligations on the Notes.
    
 
   
All of the Company's Subsidiaries, other than Thermadyne Capital and Thermadyne
Receivables, Inc., are Restricted Subsidiaries. However, under certain
circumstances, the Company will be permitted to designate current or future
Subsidiaries as Unrestricted Subsidiaries. Unrestricted Subsidiaries will not be
subject to the restrictive covenants set provided the Indenture.
    
 
                                       13
<PAGE>   17
 
   
PRINCIPAL, MATURITY AND INTEREST
    
 
   
The Notes are limited in aggregate principal amount to $207.0 million and will
mature on June 1, 2008. Interest on the Notes will accrue at the rate of 9 7/8%
per annum and will be payable semi-annually in arrears on June 1 and December 1,
beginning on December 1, 1998, to Holders of record on the immediately preceding
May 15 and November 15. Interest on the Notes will accrue from the most recent
date to which interest has been paid or, if no interest has been paid, from the
date of original issuance. Interest will be computed on the basis of a 360-day
year comprised of twelve 30-day months. Principal of, premium, if any, and
interest and Liquidated Damages, if any, on the Notes will be payable at the
office or agency of the Issuers maintained for such purpose within the City and
State of New York or, at the option of the Issuers, payment of interest and
Liquidated Damages may be made by check mailed to the Holders of the Notes at
their respective addresses set forth in the register of Holders of Notes;
provided that all payments of principal, premium, interest and Liquidated
Damages with respect to Notes represented by one or more permanent global Notes
will be paid by wire transfer of immediately available funds to the account of
the Depository Trust Company or any successor thereto. Until otherwise
designated by the Issuers, the Issuers' office or agency in New York will be the
office of the Trustee maintained for such purpose. The Notes will be issued in
denominations of $1,000 and integral multiples thereof.
    
 
   
Subject to the covenants described below, the Issuers may issue additional notes
under the Indenture having the same terms in all respects as the Notes, or in
all respects except for the payment of interest on the Notes (a) scheduled and
paid prior to the date of issuance of such notes or (b) payable on the first
interest payment date, as specified in the note, following such date of
issuance. The Notes and any additional notes would be treated as a single class
for all purposes under the Indenture.
    
 
   
SUBORDINATION
    
 
   
The payment of Subordinated Note Obligations (as hereinafter defined) will be
subordinated in right of payment, as provided in the Indenture, to the prior
payment in full in cash or cash equivalents of all Senior Indebtedness, whether
outstanding on the date of the Indenture or thereafter incurred.
    
 
   
Upon any distribution to creditors of the Issuers in a liquidation or
dissolution of the Issuers or in a bankruptcy, reorganization, insolvency,
receivership or similar proceeding relating to the Issuers or their property, an
assignment for the benefit of creditors or any marshalling of the Issuers'
assets and liabilities, the holders of Senior Indebtedness will be entitled to
receive payment in full in cash or cash equivalents of all Obligations due in
respect of such Senior Indebtedness, including interest after the commencement
of any such proceeding at the rate specified in the applicable Senior
Indebtedness, before the Holders of Notes will be entitled to receive any
payment with respect to the Subordinated Note Obligations, and until all
Obligations with respect to Senior Indebtedness are paid in full in cash or cash
equivalents, any distribution to which the Holders of Notes would be entitled
shall be made to the holders of Senior Indebtedness, except that Holders of
Notes may receive and retain Permitted Junior Securities and payments made from
the trust described under "--Legal Defeasance and Covenant Defeasance."
    
 
                                       14
<PAGE>   18
 
   
The Issuers also may not make any payment upon or in respect of the Subordinated
Note Obligations, except in Permitted Junior Securities or from the trust
described under "--Legal Defeasance and Covenant Defeasance," if:
    
 
   
     - a default in the payment of the principal of, premium, if any, or
       interest on or commitment fees relating to, Designated Senior
       Indebtedness occurs and is continuing beyond any applicable period of
       grace or
    
 
   
     - any other default occurs and is continuing with respect to Designated
       Senior Indebtedness that permits holders of the Designated Senior
       Indebtedness as to which such default relates to accelerate its maturity
       and the Trustee receives a notice of such default (a "Payment Blockage
       Notice") from the Issuers or the holders of any Designated Senior
       Indebtedness.
    
 
   
Payments on the Senior Subordinated Notes may and shall be resumed (a) in the
case of a payment default, upon the date on which such default is cured or
waived and (b) in case of a nonpayment default, the earlier of the date on which
such nonpayment default is cured or waived or 179 days after the date on which
the applicable Payment Blockage Notice is received, unless the maturity of any
Designated Senior Indebtedness has been accelerated. No new period of payment
blockage may be commenced unless and until 360 days have elapsed since the
effectiveness of the immediately prior Payment Blockage Notice. No nonpayment
default that existed or was continuing on the date of delivery of any Payment
Blockage Notice to the Trustee shall be, or be made, the basis for a subsequent
Payment Blockage Notice unless such default shall have been waived or cured for
a period of not less than 90 days.
    
 
   
"Designated Senior Indebtedness" means
    
 
   
     - any Indebtedness outstanding under the New Credit Facility and
    
 
   
     - any other Senior Indebtedness permitted under the Indenture the principal
       amount of which is $25.0 million or more and that has been designated by
       the Issuers as "Designated Senior Indebtedness."
    
 
   
"Permitted Junior Securities" means Equity Interests in the Issuers or debt
securities of the Issuers that are subordinated to all Senior Indebtedness, and
any debt securities issued in exchange for Senior Indebtedness, to substantially
the same extent as, or to a greater extent than, the Senior Subordinated Notes
are subordinated to Senior Indebtedness.
    
 
   
"Senior Indebtedness" means, with respect to any Person,
    
 
   
     - all Obligations of such Person outstanding under the New Credit Facility
       and all Hedging Obligations payable to a lender or an Affiliate thereof
       or to a Person that was a lender or an Affiliate thereof at the time the
       contract was entered into under the New Credit Facility or any of its
       Affiliates, including interest accruing subsequent to the filing of, or
       which would have accrued but for the filing of, a petition for
       bankruptcy, whether or not such interest is an allowable claim in such
       bankruptcy proceeding,
    
 
   
     - any other Indebtedness, unless the instrument under which such
       Indebtedness is incurred expressly provides that it is subordinated in
       right of payment to any other Senior Indebtedness of such Person and
    
 
   
     - all Obligations with respect to the foregoing.
    
 
                                       15
<PAGE>   19
 
   
Notwithstanding anything to the contrary in the foregoing, Senior Indebtedness
will not include:
    
 
   
     - any liability for federal, state, local or other taxes,
    
 
   
     - any Indebtedness of such Person, other than pursuant to the New Credit
       Facility, to any of its Subsidiaries or other Affiliates,
    
 
   
     - any trade payables or
    
 
   
     - any Indebtedness that is incurred in violation of the Indenture.
    
 
   
"Subordinated Note Obligations" means all Obligations with respect to the Senior
Subordinated Notes, including principal, premium, if any, interest and
Liquidated Damages payable pursuant to the terms of the Senior Subordinated
Notes, including upon the acceleration or redemption thereof, together with and
including any amounts received or receivable upon the exercise of rights of
rescission or other rights of action, including claims for damages, or
otherwise.
    
 
   
The Indenture further requires that the Issuers promptly notify holders of
Senior Indebtedness if payment of the Notes is accelerated because of an Event
of Default (as hereinafter defined). As a result of the subordination provisions
described above, in the event of a liquidation or insolvency, Holders of Notes
may recover less ratably than creditors of the Issuers who are holders of Senior
Indebtedness.
    
 
   
NOTE GUARANTEES
    
 
   
The Company's payment obligations under the Notes will be jointly and severally
guaranteed (the "Note Guarantees") by the Guarantors. The Note Guarantee of each
Guarantor will be subordinated to the prior payment in full in cash or cash
equivalents of all Senior Indebtedness of such Guarantor, including such
Guarantor's guarantee of the New Credit Facility, to the same extent that the
Notes are subordinated to Senior Indebtedness of the Company. The obligations of
each Guarantor under its Note Guarantee will be limited so as not to constitute
a fraudulent conveyance under applicable law.
    
 
   
The Indenture provides that no Guarantor may consolidate with or merge with or
into, whether or not such Guarantor is the surviving Person, another
corporation, Person or entity whether or not affiliated with such Guarantor
unless:
    
 
   
     - subject to the provisions of the following paragraph, the Person formed
       by or surviving any such consolidation or merger, if other than such
       Guarantor, assumes all the obligations of such Guarantor pursuant to a
       supplemental indenture in form and substance reasonably satisfactory to
       the Trustee, under the Notes, the Indenture and the Registration Rights
       Agreement;
    
 
   
     - immediately after giving effect to such transaction, no Default or Event
       of Default exists;
    
 
   
     - the Company would, at the time of such transaction and after giving pro
       forma effect thereto as if the transaction had occurred at the beginning
       of the applicable four-quarter period, be permitted to incur at least
       $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage
       Ratio test provided in the covenant described under the caption
       "--Incurrence of Indebtedness and Issuance of Preferred Stock."
    
 
                                       16
<PAGE>   20
 
   
The requirements of the preceding clause will not apply in the case of a
consolidation with or merger with or into the Company or another Guarantor.
    
 
   
The Indenture provides that, if there is a sale or other disposition of all of
the assets of any Guarantor, by way of merger, consolidation or otherwise, or a
sale or other disposition of all of the capital stock of any Guarantor, such
Guarantor, in the event of a sale or other disposition, by way of such a merger,
consolidation or otherwise, of all of the capital stock of such Guarantor, or
the corporation acquiring the property, in the event of a sale or other
disposition of all of the assets of such Guarantor, will be released and
relieved of any obligations under its Note Guarantee; provided that the Net
Proceeds of such sale or other disposition are applied in accordance with the
applicable provisions of the Indenture. See "Repurchase at the Option of
Holders."
    
 
   
OPTIONAL REDEMPTION
    
 
   
Except as provided below, the Notes will not be redeemable at the Issuers'
option before June 1, 2003. Thereafter, the Notes will be redeemable at any time
at the option of the Issuers, in whole or in part, upon not less than 30 nor
more than 60 days' notice, in cash at the redemption prices, expressed as
percentages of principal amount, set forth below, plus accrued and unpaid
interest and Liquidated Damages, if any, thereon to the applicable redemption
date, if redeemed during the twelve-month period beginning on June 1 of the
years indicated below:
    
 
   
<TABLE>
<CAPTION>
                      YEAR                         PERCENTAGE
                      ----                         ----------
<S>                                                <C>
2003............................................    104.938%
2004............................................    103.292%
2005............................................    101.646%
2006 and thereafter.............................    100.000%
</TABLE>
    
 
   
Notwithstanding the foregoing, on or before June 1, 2001, the Issuers may redeem
up to 35% of the aggregate principal amount of Notes ever issued under the
Indenture in cash at a redemption price of 109.875% of the principal amount
thereof, plus accrued and unpaid interest and Liquidated Damages, if any,
thereon to the redemption date, with the net cash proceeds of one or more Public
Equity Offerings; provided that at least 65% of the aggregate principal amount
of Notes ever issued under the Indenture remains outstanding immediately after
the occurrence of any such redemption; and provided further that such redemption
shall occur within 90 days of the date of the closing of any such Public Equity
Offering.
    
 
   
In addition, at any time before June 1, 2003, the Issuers may, at their option
upon the occurrence of a Change of Control, redeem the Notes, in whole but not
in part, upon not less than 30 nor more than 60 days' prior notice, but in no
event may any such redemption occur more than 60 days after the occurrence of
such Change of Control, in cash at a redemption price equal to:
    
 
   
     - the present value of the sum of all the remaining interest, excluding
       accrued and unpaid interest, if any, premium and principal payments that
       would become due on the Notes as if the Notes were to remain outstanding
       and be redeemed on June 1, 2003, computed using a discount rate equal to
       the Treasury Rate plus 50 basis points, plus
    
 
   
     - accrued and unpaid interest and Liquidated Damages, if any, to the date
       of redemption.
    
 
                                       17
<PAGE>   21
 
   
"Treasury Rate" means, as of any redemption date, the yield to maturity as of
the redemption date of United States Treasury securities with a constant
maturity, as compiled and published in the most recent Federal Reserve
Statistical Release H.15 (519) that has become publicly available at least two
Business Days prior to the redemption date (or, if such Statistical Release is
no longer published, any publicly available source of similar market data) most
nearly equal to the period from the redemption date to June 1, 2003; provided
that if the period from the redemption date to June 1, 2003 is less than one
year, the weekly average yield on actually traded United States Treasury
securities adjusted to a constant maturity of one year shall be used.
    
 
   
SELECTION AND NOTICE
    
 
   
If less than all of the Notes are to be redeemed at any time, selection of Notes
for redemption will be made by the Trustee in compliance with the requirements
of the principal national securities exchange, if any, on which the Notes are
listed, or, if the Notes are not so listed, on a pro rata basis, by lot or by
such method as the Trustee shall deem fair and appropriate; provided that no
Notes of $1,000 or less shall be redeemed in part. Notices of redemption shall
be mailed by first class mail at least 30 but not more than 60 days before the
redemption date to each Holder of Notes to be redeemed at its registered
address. Notices of redemption may not be conditional. If any Note is to be
redeemed in part only, the notice of redemption that relates to such Note shall
state the portion of the principal amount thereof to be redeemed. A new Note in
principal amount equal to the unredeemed portion thereof will be issued in the
name of the Holder thereof upon cancellation of the original Note. Notes called
for redemption become due on the date fixed for redemption. On and after the
redemption date, interest ceases to accrue on Notes or portions of them called
for redemption.
    
 
   
MANDATORY REDEMPTION
    
 
   
The Issuers are not required to make mandatory redemption of, or sinking fund
payments with respect to, the Notes.
    
 
   
REPURCHASE AT THE OPTION OF HOLDERS
    
 
   
CHANGE OF CONTROL
    
 
   
Upon the occurrence of a Change of Control, each Holder of Notes will have the
right to require the Issuers to repurchase all or any part, equal to $1,000 or
an integral multiple thereof, of such Holder's Notes pursuant to the offer
described below (the "Change of Control Offer") at an offer price in cash equal
to 101% of the aggregate principal amount thereof, plus accrued and unpaid
interest and Liquidated Damages, if any, thereon to the date of repurchase (the
"Change of Control Payment"). Within 60 days following any Change of Control,
the Issuers will, or will cause the Trustee to, mail a notice to each Holder
describing the transaction or transactions that constitute the Change of Control
and offering to repurchase Notes on the date specified in such notice, which
date shall be no earlier than 30 days and no later than 60 days from the date
such notice is mailed (the "Change of Control Payment Date"), pursuant to the
procedures required by the Indenture and described in such notice. The Issuers
will comply with the requirements of Rule 14e-1 under the Securities Exchange
Act and any other securities laws and regulations thereunder to the extent such
laws and regulations are applicable in connection with the repurchase of the
Notes as a result of a Change of Control. To the extent that the provisions of
any securities laws or regulations conflict with the provisions of the Indenture
relating to such Change of Control Offer, the Issuers will comply with the
    
 
                                       18
<PAGE>   22
 
   
applicable securities laws and regulations and shall not be deemed to have
breached their obligations described in the Indenture by virtue thereof.
    
 
   
On the Change of Control Payment Date, the Issuers will, to the extent lawful,
    
 
   
     - accept for payment all Notes or portions thereof properly tendered
       pursuant to the Change of Control Offer,
    
 
   
     - deposit with the Paying Agent an amount equal to the Change of Control
       Payment in respect of all Notes or portions thereof so tendered and
    
 
   
     - deliver or cause to be delivered to the Trustee the Notes so accepted
       together with an Officers' Certificate stating the aggregate principal
       amount of Notes or portions thereof being purchased by the Issuers.
    
 
   
The Paying Agent will promptly mail to each Holder of Notes so tendered the
Change of Control Payment for such Notes, and the Trustee will promptly
authenticate and mail (or cause to be transferred by book-entry) to each Holder
a new Note equal in principal amount to any unpurchased portion of the Notes
surrendered, if any; provided that each such new Note will be in a principal
amount of $1,000 or an integral multiple thereof. The Indenture will provide
that, before complying with the provisions of this covenant, but in any event
within 90 days following a Change of Control, the Issuers will either repay all
outstanding Senior Indebtedness or obtain the requisite consents, if any, under
all agreements governing outstanding Senior Indebtedness to permit the
repurchase of Notes required by this covenant. The Issuers will publicly
announce the results of the Change of Control Offer on or as soon as practicable
after the Change of Control Payment Date.
    
 
   
The Change of Control provisions described above will be applicable whether or
not any other provisions of the Indenture are applicable. Except as described
above with respect to a Change of Control, the Indenture does not contain
provisions that permit the Holders of the Notes to require that the Issuers
repurchase or redeem the Notes if a takeover, recapitalization or similar
transaction occurs.
    
 
   
The New Credit Facility prohibits the Issuers from purchasing any Notes and also
will provide that certain change of control events, which may include events not
otherwise constituting a Change of Control under the Indenture, with respect to
the Issuers would constitute a default thereunder. Any future credit agreements
or other agreements relating to Senior Indebtedness to which any Issuer becomes
a party may contain similar restrictions and provisions. In the event a Change
of Control occurs at a time when the Issuers are prohibited from purchasing
Notes, the Issuers could seek the consent of its lenders to the purchase of
Notes or could attempt to refinance the borrowings that contain such
prohibition. If the Issuers do not obtain this consent or repay such borrowings,
the Issuers will remain prohibited from purchasing Notes. In such case, the
Issuers' failure to purchase tendered Notes would constitute an Event of Default
under the Indenture, which would, in turn, constitute a default under the New
Credit Facility. In these circumstances, the subordination provisions in the
Indenture would likely restrict payments to the Holders of Notes.
    
 
   
The Issuers will not be required to make a Change of Control Offer upon a Change
of Control if a third party makes the Change of Control Offer in the manner, at
the times and otherwise in compliance with the requirements set forth in the
Indenture applicable to a Change of Control Offer made by the Company and
purchases all Notes validly tendered and not withdrawn under such Change of
Control Offer.
    
 
                                       19
<PAGE>   23
 
   
"Change of Control" means the occurrence of any of the following:
    
 
   
     - the sale, lease, transfer, conveyance or other disposition, other than by
       way of merger or consolidation, in one or a series of related
       transactions, of all or substantially all of the assets of the Company
       and its Subsidiaries, taken as a whole, to any "person" or "group," as
       such terms are used in Section 13(d) of the Securities Exchange Act,
       other than the Principals and their Related Parties;
    
 
   
     - the adoption of a plan for the liquidation or dissolution of one or both
       of the Issuers;
    
 
   
     - the consummation of any transaction, including, without limitation, any
       merger or consolidation, the result of which is that any "person" or
       "group," as such terms are used in Section 13(d) of the Securities
       Exchange Act, other than the Principals and their Related Parties,
       becomes the "beneficial owner," as such term is defined in Rule 13d-3 and
       Rule 13d-5 under the Securities Exchange Act,), directly or indirectly
       through one or more intermediaries, of 50% or more of the voting power of
       the outstanding voting stock of the Company;
    
 
   
     - the first day on which a majority of the members of the board of
       directors of the Company are not Continuing Members; or
    
 
   
     - the first day on which the Company fails to own 100% of the issued and
       outstanding Equity Interests of Thermadyne Capital, other than by reason
       of the merger of Thermadyne Capital with and into a corporate successor
       to the Company.
    
 
   
The definition of Change of Control includes a phrase relating to the sale,
lease, transfer, conveyance or other disposition of "all or substantially all"
of the assets of the Company and its Subsidiaries taken as a whole. Although
there is a developing body of case law interpreting the phrase "substantially
all," there is no precise established definition of the phrase under applicable
law. Accordingly, the ability of a Holder of Notes to require the Issuers to
repurchase the Notes as a result of a sale, lease, transfer, conveyance or other
disposition of less than all of the assets of the Company and its Subsidiaries
taken as a whole to another Person or group may be uncertain.
    
 
   
"Continuing Members" means, as of any date of determination, any member of the
board of directors of the Company who
    
 
   
     - was a member of such board of directors immediately after consummation of
       the Merger or
    
 
   
     - was nominated for election or elected to the board of directors with the
       approval of, or whose election to the board of directors was ratified by,
       at least a majority of the Continuing Members who were members of the
       board of directors at the time of such nomination or election.
    
 
   
ASSET SALES
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, consummate an Asset Sale unless (a) the Company or
such Restricted Subsidiary, as the case may be, receives consideration at the
time of the Asset Sale at least equal to the fair market value, evidenced by a
resolution of the board of directors provided in an Officers' Certificate
delivered to the Trustee, of the assets or Equity Interests issued or sold or
otherwise disposed of and (b) at least 75% of the consideration therefor
received by the Company or such Restricted Subsidiary is in the form of (i) cash
or Cash Equivalents or (ii) property or assets that are used or useful in a
    
 
                                       20
<PAGE>   24
 
   
Permitted Business, or the Capital Stock of any Person engaged in a Permitted
Business if, as a result of the acquisition by the Company or any Restricted
Subsidiary thereof, such Person becomes a Restricted Subsidiary; provided that
the amount of (x) any liabilities, as shown on the Company's or such Restricted
Subsidiary's most recent balance sheet, of the Company or any Restricted
Subsidiary (other than contingent liabilities and liabilities that are by their
terms subordinated to the Senior Subordinated Notes or any guarantee thereof)
that are assumed by the transferee of any such assets pursuant to a customary
novation agreement that releases the Company or such Restricted Subsidiary from
further liability, (y) any securities, notes or other obligations received by
the Company or any such Restricted Subsidiary from such transferee that are
contemporaneously (subject to ordinary settlement periods) converted by the
Company or such Restricted Subsidiary into cash or Cash Equivalents (to the
extent of the cash or Cash Equivalents received), and (z) any Designated Noncash
Consideration received by the Company or any of its Restricted Subsidiaries in
such Asset Sale having an aggregate fair market value, taken together with all
other Designated Noncash Consideration received pursuant to this clause (z) that
is at that time outstanding, not to exceed 15% of Total Assets at the time of
the receipt of such Designated Noncash Consideration (with the fair market value
of each item of Designated Noncash Consideration being measured at the time
received and without giving effect to subsequent changes in value), shall be
deemed to be cash for purposes of this provision; and provided further that the
75% limitation referred to in clause (b) above will not apply to any Asset Sale
in which the cash or Cash Equivalents portion of the consideration received
therefrom, determined in accordance with the foregoing proviso, is equal to or
greater than what the after-tax proceeds would have been had such Asset Sale
complied with the aforementioned 75% limitation.
    
 
   
Within 365 days after the receipt of any Net Proceeds from an Asset Sale, the
Company or any such Restricted Subsidiary shall apply such Net Proceeds, at its
option (or to the extent the Company is required to apply such Net Proceeds
pursuant to the terms of the New Credit Facility), to (a) repay or purchase
Senior Indebtedness or Pari Passu Indebtedness of the Company or any
Indebtedness of any Restricted Subsidiary, provided that, if the Company shall
so repay or purchase Pari Passu Indebtedness of the Company, it will equally and
ratably reduce Indebtedness under the Notes if the Notes are then redeemable,
or, if the Notes may not then be redeemed, the Company shall make an offer, in
accordance with the procedures set forth below for an Asset Sale Offer, to all
Holders of Notes to purchase at a purchase price equal to 100% of the principal
amount of the Notes, plus accrued and unpaid interest and Liquidated Damages, if
any, thereon to the date of purchase, the Notes that would otherwise be
redeemed, or (b) an investment in property, the making of a capital expenditure
or the acquisition of assets that are used or useful in a Permitted Business, or
Capital Stock of any Person primarily engaged in a Permitted Business if (i) as
a result of the acquisition by the Company or any Restricted Subsidiary thereof,
such Person becomes a Restricted Subsidiary or (ii) the Investment in such
Capital Stock is permitted by clause (f) of the definition of Permitted
Investments. Pending the final application of any such Net Proceeds, the Company
may temporarily reduce Indebtedness or otherwise invest such Net Proceeds in any
manner that is not prohibited by the Indenture. Any Net Proceeds from Asset
Sales that are not applied or invested as provided in the first sentence of this
paragraph will be deemed to constitute "Excess Proceeds." When the aggregate
amount of Excess Proceeds exceeds $15.0 million, the Company will be required to
make an offer to all Holders of Notes (an "Asset Sale Offer") to purchase the
maximum principal amount of Notes that may be purchased out of the Excess
Proceeds, at an offer price in cash in an amount equal to 100% of the principal
amount thereof, plus accrued and unpaid interest and Liquidated Damages, if
    
 
                                       21
<PAGE>   25
 
   
any, thereon to the date of purchase, in accordance with the procedures provided
in the Indenture. To the extent that any Excess Proceeds remain after
consummation of an Asset Sale Offer, the Company may use such Excess Proceeds
for any purpose not otherwise prohibited by the Indenture. If the aggregate
principal amount of Notes surrendered by Holders thereof in connection with an
Asset Sale Offer exceeds the amount of Excess Proceeds, the Trustee shall select
the Notes to be purchased as provided under "--Selection and Notice." Upon
completion of the offer to purchase, the amount of Excess Proceeds shall be
reset at zero.
    
 
   
The Company will comply with the requirements of Rule 14e-1 under the Securities
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with the
repurchase of the Notes pursuant to an Asset Sale Offer. To the extent that the
provisions of any securities laws or regulations conflict with the provisions of
the Indenture relating to the Asset Sale Offer, the Company will comply with the
applicable securities laws and regulations and shall not be deemed to have
breached its obligations described in the Indenture by virtue thereof.
    
 
   
CERTAIN COVENANTS
    
 
   
RESTRICTED PAYMENTS
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, directly or indirectly,
    
 
   
     - declare or pay any dividend or make any other payment or distribution on
       account of the Company's or any of its Restricted Subsidiaries' Equity
       Interests (other than dividends or distributions payable in Equity
       Interests, other than Disqualified Stock, of the Company or dividends or
       distributions payable to the Company or any Wholly Owned Restricted
       Subsidiary of the Company);
    
 
   
     - purchase, redeem or otherwise acquire or retire for value any Equity
       Interests of the Company, any of its Restricted Subsidiaries or any other
       Affiliate of the Company, other than any such Equity Interests owned by
       the Company or any Restricted Subsidiary of the Company;
    
 
   
     - make any principal payment on or with respect to, or purchase, redeem,
       defease or otherwise acquire or retire for value, any Indebtedness of the
       Company that is subordinated in right of payment to the Senior
       Subordinated Notes, except in accordance with the mandatory redemption or
       repayment provisions provided in the original documentation governing
       such Indebtedness (but not pursuant to any mandatory offer to repurchase
       upon the occurrence of any event); or
    
 
   
     - make any Restricted Investment.
    
 
   
All such payments and other actions enumerated above being collectively referred
to as "Restricted Payments," unless, at the time of and after giving effect to
such Restricted Payment:
    
 
   
     (i)  no Default or Event of Default shall have occurred and be continuing
          or would occur as a consequence thereof;
    
 
   
     (ii)  the Company would, immediately after giving pro forma effect thereto
           as if such Restricted Payment had been made at the beginning of the
           applicable four-quarter period, have been permitted to incur at least
           $1.00 of additional Indebtedness pursuant to the Fixed Charge
           Coverage Ratio test provided in the
    
 
                                       22
<PAGE>   26
 
   
first paragraph of the covenant described under the caption "--Incurrence of
Indebtedness and Issuance of Preferred Stock"; and
    
 
   
     (iii) such Restricted Payment, together with the aggregate amount of all
           other Restricted Payments made by the Company and its Restricted
           Subsidiaries after the date of the Indenture (excluding Restricted
           Payments permitted by clauses (a), to the extent that the declaration
           of any dividend referred to therein reduces amounts available for
           Restricted Payments pursuant to this sentence, (b), (c), (e) through
           (j), (l), (m), (p), (q) and (r) of the next succeeding paragraph), is
           less than the sum, without duplication, of (A) 50% of the
           Consolidated Net Income of the Company for the period (taken as one
           accounting period) commencing July 1, 1998 to the end of the
           Company's most recently ended fiscal quarter for which internal
           financial statements are available at the time of such Restricted
           Payment (or, if such Consolidated Net Income for such period is a
           deficit, less 100% of such deficit), plus (B) 100% of the Qualified
           Proceeds received by the Company on or after the date of the
           Indenture from contributions to the Company's capital or from the
           issue or sale on or after the date of the Indenture of Equity
           Interests of the Company or of Disqualified Stock or convertible debt
           securities of the Company to the extent that they have been converted
           into such Equity Interests (other than Equity Interests, Disqualified
           Stock or convertible debt securities sold to a Subsidiary of the
           Company and other than Disqualified Stock or convertible debt
           securities that have been converted into Disqualified Stock), plus
           (C) the amount equal to the net reduction in Investments in Persons
           after the date of the Indenture who are not Restricted Subsidiaries
           (other than Permitted Investments) resulting from (x) Qualified
           Proceeds received as a dividend, repayment of a loan or advance or
           other transfer of assets (valued at the fair market value thereof) to
           the Company or any Restricted Subsidiary from such Persons, (y)
           Qualified Proceeds received upon the sale or liquidation of such
           Investment and (z) the redesignation of Unrestricted Subsidiaries
           (other than any Unrestricted Subsidiary designated as such pursuant
           to clause (k) or (o) of the following paragraph) whose assets are
           used or useful in, or which is engaged in, one or more Permitted
           Business as Restricted Subsidiaries, valued (proportionate to the
           Company's equity interest in the Subsidiary) at the fair market value
           of the net assets of the Subsidiary at the time of such
           redesignation.
    
 
   
The foregoing provisions will not prohibit:
    
 
   
     (a) the payment of any dividend within 60 days after the date of
     declaration thereof, if at the date of declaration such payment would have
     complied with the provisions of the Indenture;
    
 
   
     (b) (i) the redemption, repurchase, retirement, defeasance or other
     acquisition of any subordinated Indebtedness or Equity Interests of the
     Company (the "Retired Capital Stock") in exchange for, or out of the net
     cash proceeds of the substantially concurrent sale (other than to a
     Subsidiary of the Company) of, other Equity Interests of the Company, other
     than any Disqualified Stock (the "Refunding Capital Stock"), provided that
     the amount of any net cash proceeds that are utilized for any such
     redemption, repurchase, retirement, defeasance or other acquisition shall
     be excluded from clause (iii)(B) of the preceding paragraph and (ii) if
     immediately prior to the retirement of Retired Capital Stock, the
     declaration and payment of dividends thereon was permitted under clause (f)
     of this paragraph, the declaration and payment of dividends on the
     Refunding Capital Stock in an aggregate amount per
    
 
                                       23
<PAGE>   27
 
   
     year no greater than the aggregate amount of dividends per annum that was
     declarable and payable on such Retired Capital Stock immediately before
     such retirement; provided that, at the time of the declaration of any such
     dividends, no Default or Event of Default shall have occurred and be
     continuing or would occur as a consequence thereof;
    
 
   
     (c) the defeasance, redemption, repurchase, retirement or other acquisition
     of subordinated Indebtedness of the Company with the net cash proceeds from
     an incurrence of, or in exchange for, Permitted Refinancing Indebtedness;
    
 
   
     (d) the repurchase, redemption or other acquisition or retirement for value
     of any Equity Interests of the Company or Thermadyne Holdings held by any
     member of Thermadyne Holdings' or the Company's, or any of its Restricted
     Subsidiaries', management pursuant to any management equity subscription
     agreement or stock option agreement and any dividend to Thermadyne Holdings
     to fund any such repurchase, redemption, acquisition or retirement,
     provided that the aggregate price paid for all such repurchased, redeemed,
     acquired or retired Equity Interests shall not exceed (x) $7.5 million in
     any calendar year, with unused amounts in any calendar year being carried
     over to succeeding calendar years subject to a maximum (without giving
     effect to the following clause (y)) of $15.0 million in any calendar year,
     plus (y) the aggregate cash proceeds received by the Company during such
     calendar year from any reissuance of Equity Interests by the Company or
     Thermadyne Holdings to members of management of the Company and its
     Restricted Subsidiaries and (ii) no Default or Event of Default shall have
     occurred and be continuing immediately after such transaction;
    
 
   
     (e) payments and transactions in connection with the Recapitalization, the
     New Credit Facility, including commitment, syndication and arrangement fees
     payable thereunder, and the application of the proceeds thereof, and the
     payment of fees and expenses with respect thereto;
    
 
   
     (f) the declaration and payment of dividends to holders of any class or
     series of preferred stock, other than Disqualified Stock, provided that, at
     the time of such issuance, after giving effect to such issuance on a pro
     forma basis, the Fixed Charge Coverage Ratio for the Company for the most
     recently ended four full fiscal quarters for which internal financial
     statements are available immediately preceding the date of such issuance
     would have been no less than 2.0 to 1;
    
 
   
     (g) the payment of dividends or the making of loans or advances by the
     Company to Thermadyne Holdings not to exceed $5.0 million in any fiscal
     year for costs and expenses incurred by Thermadyne Holdings in its capacity
     as a holding company or for services rendered by Thermadyne Holdings on
     behalf of the Company;
    
 
   
     (h) payments or distributions to Thermadyne Holdings pursuant to any Tax
     Sharing Agreement;
    
 
   
     (i) the payment of dividends by a Restricted Subsidiary on any class of
     common stock of such Restricted Subsidiary if (i) such dividend is paid pro
     rata to all holders of such class of common stock and (ii) at least 51% of
     such class of common stock is held by the Company or one or more of its
     Restricted Subsidiaries;
    
 
   
     (j) the repurchase of any class of common stock of a Restricted Subsidiary
     if (i) such repurchase is made pro rata with respect to such class of
     common stock and (ii) at least 51% of such class of common stock is held by
     the Company or one or more of its Restricted Subsidiaries;
    
 
                                       24
<PAGE>   28
 
   
     (k) any other Restricted Investment made in a Permitted Business which,
     together with all other Restricted Investments made pursuant to this clause
     (k) since the date of the Indenture, does not exceed $25.0 million (in each
     case, after giving effect to all subsequent reductions in the amount of any
     Restricted Investment made pursuant to this clause (k), either as a result
     of (i) the repayment or disposition thereof for cash or (ii) the
     redesignation of an Unrestricted Subsidiary as a Restricted Subsidiary,
     valued proportionate to the Company's equity interest in such Subsidiary at
     the time of such redesignation, at the fair market value of the net assets
     of such Subsidiary at the time of such redesignation), in the case of
     clause (i) and (ii), not to exceed the amount of such Restricted Investment
     previously made pursuant to this clause (k); provided that no Default or
     Event of Default shall have occurred and be continuing immediately after
     making such Restricted Investment;
    
 
   
     (l) the declaration and payment of dividends to holders of any class or
     series of Disqualified Stock of the Company or any Restricted Subsidiary
     issued on or after the date of the Indenture in accordance with the
     covenant described under the caption "--Incurrence of Indebtedness and
     Issuance of Preferred Stock"; provided that no Default or Event of Default
     shall have occurred and be continuing immediately after making such
     Restricted Payment;
    
 
   
     (m) repurchases of Equity Interests deemed to occur upon exercise of stock
     options if such Equity Interests represent a portion of the exercise price
     of such options;
    
 
   
     (n) the payment of dividends or distributions on the Company's membership
     interests, following the first public offering of the Company's membership
     interests or Thermadyne Holdings' common stock after the date of the
     Indenture, of up to 6.0% per annum of (i) the net proceeds received by the
     Company from such public offering of its membership interests or (ii) the
     net proceeds received by the Company from such public offering of
     Thermadyne Holdings' common stock as common equity or preferred equity
     (other than Disqualified Stock), other than, in each case, with respect to
     public offerings with respect to the Company's membership interests or
     Thermadyne Holdings' common stock registered on Form S-8; provided that no
     Default or Event of Default shall have occurred and be continuing
     immediately after any such payment of dividends or distributions;
    
 
   
     (o) any other Restricted Payment which, together with all other Restricted
     Payments made pursuant to this clause (o) since the date of the Indenture,
     does not exceed $25.0 million (in each case, after giving effect to all
     subsequent reductions in the amount of any Restricted Investment made
     pursuant to this clause (o) either as a result of (i) the repayment or
     disposition thereof for cash or (ii) the redesignation of an Unrestricted
     Subsidiary as a Restricted Subsidiary, valued proportionate to the
     Company's equity interest in such Subsidiary at the time of such
     redesignation, at the fair market value of the net assets of such
     Subsidiary at the time of such redesignation, in the case of clause (i) and
     (ii), not to exceed the amount of such Restricted Investment previously
     made pursuant to this clause (o); provided that no Default or Event of
     Default shall have occurred and be continuing immediately after making such
     Restricted Payment;
    
 
   
     (p) the pledge by the Company of the Capital Stock of an Unrestricted
     Subsidiary of the Company to secure Non-Recourse Debt of such Unrestricted
     Subsidiary;
    
 
   
     (q) the purchase, redemption or other acquisition or retirement for value
     of any Equity Interests of any Restricted Subsidiary issued after the date
     of the Indenture, provided that the aggregate price paid for any such
     repurchased, redeemed, acquired
    
 
                                       25
<PAGE>   29
 
   
     or retired Equity Interests shall not exceed the sum of (i) the amount of
     cash and Cash Equivalents received by such Restricted Subsidiary from the
     issue or sale thereof and (ii) any accrued dividends thereon the payment of
     which would be permitted pursuant to clause (l) above;
    
 
   
     (r) distributions or payments of Receivables Fees; and
    
 
   
     (s) dividends or distributions to Thermadyne Holdings solely in connection
     with the purchase, redemption or other acquisition or retirement for value
     of rights issued pursuant to Thermadyne Holdings' Rights Plan as in effect
     on the date of the Indenture.
    
 
   
The board of directors of the Company may designate any Restricted Subsidiary to
be an Unrestricted Subsidiary if such designation would not cause a Default. For
purposes of making this designation, all outstanding Investments by the Company
and its Restricted Subsidiaries, except to the extent repaid in cash, in the
Subsidiary so designated will be deemed to be Restricted Payments at the time of
the designation and will reduce the amount available for Restricted Payments
under the first paragraph of this covenant. All of these outstanding Investments
will be deemed to constitute Restricted Investments in an amount equal to the
greater of (A) the net book value of such Investments at the time of the
designation and (B) the fair market value of such Investments at the time of the
designation. The designation will only be permitted if such Restricted
Investment would be permitted at such time and if such Restricted Subsidiary
otherwise meets the definition of an Unrestricted Subsidiary.
    
 
   
The amount of (A) all Restricted Payments, other than cash, shall be the fair
market value on the date of the Restricted Payment of the asset(s) or securities
proposed to be transferred or issued by the Company or such Restricted
Subsidiary, as the case may be, pursuant to the Restricted Payment and (B)
Qualified Proceeds, other than cash shall be the fair market value on the date
of receipt thereof by the Company of such Qualified Proceeds. The fair market
value of any non-cash Restricted Payment shall be determined by the board of
directors of the Company whose resolution with respect thereto shall be
delivered to the Trustee. Not later than the date of making any Restricted
Payment, the Company shall deliver to the Trustee an Officers' Certificate
stating that such Restricted Payment is permitted and providing the basis upon
which the calculations required by the covenant "Restricted Payments" were
computed.
    
 
   
INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED STOCK
    
 
   
The Indenture provides that:
    
 
   
     - the Company will not, and will not permit any of its Restricted
       Subsidiaries to, directly or indirectly, create, incur, issue, assume,
       guarantee or otherwise become directly or indirectly liable, contingently
       or otherwise, with respect to (collectively, "incur") any Indebtedness
       (including Acquired Indebtedness);
    
 
   
     - the Company will not, and will not permit any of its Restricted
       Subsidiaries to, issue any shares of Disqualified Stock; and
    
 
   
     - the Company will not permit any of its Restricted Subsidiaries to issue
       any shares of preferred stock; provided that the Company or any
       Restricted Subsidiary may incur Indebtedness (including Acquired
       Indebtedness) or issue shares of Disqualified Stock if the Fixed Charge
       Coverage Ratio for the Company's most recently ended four full fiscal
       quarters for which internal financial statements are available
       immediately preceding the date on which such additional Indebtedness is
       incurred
    
 
                                       26
<PAGE>   30
 
   
       or such Disqualified Stock is issued would have been at least 2.0 to 1,
       determined on a consolidated pro forma basis (including a pro forma
       application of the net proceeds therefrom), as if the additional
       Indebtedness had been incurred, or the Disqualified Stock had been
       issued, as the case may be, at the beginning of such four-quarter period.
    
 
   
The provisions of the first paragraph of this covenant will not apply to the
incurrence of any of the following items of Indebtedness (collectively,
"Permitted Indebtedness"):
    
 
   
     (a)  the incurrence by the Company and its Restricted Subsidiaries of
     Indebtedness under the New Credit Facility; provided that the aggregate
     principal amount of all Indebtedness, with letters of credit being deemed
     to have a principal amount equal to the maximum potential liability of the
     Company and such Restricted Subsidiaries thereunder, then classified as
     having been incurred in reliance upon this clause (a) that remains
     outstanding under the New Credit Facility after giving effect to such
     incurrence does not exceed an amount equal to $430.0 million;
    
 
   
     (b)  the incurrence by the Company and its Restricted Subsidiaries of
     Existing Indebtedness;
    
 
   
     (c)  the incurrence by the Issuers of Indebtedness represented by the Notes
     and the Indenture and by the Guarantors of Indebtedness represented by the
     Note Guarantees;
    
 
   
     (d)  the incurrence by the Company or any of its Restricted Subsidiaries of
     Indebtedness represented by Capital Expenditure Indebtedness, Capital Lease
     Obligations or purchase money obligations, in each case, incurred for the
     purpose of financing all or any part of the purchase price or cost of
     construction or improvement of property, plant or equipment used in the
     business of the Company or such Restricted Subsidiary, in an aggregate
     principal amount, or accreted value, as applicable, not to exceed $40.0
     million outstanding after giving effect to such incurrence;
    
 
   
     (e)  Indebtedness arising from agreements of the Company or any Restricted
     Subsidiary providing for indemnification, adjustment of purchase price or
     similar obligations, in each case, incurred or assumed in connection with
     the disposition of any business, assets or a Subsidiary, other than
     guarantees of Indebtedness incurred by any Person acquiring all or any
     portion of such business, assets or Restricted Subsidiary, for the purpose
     of financing such acquisition; provided that (A) such Indebtedness is not
     reflected on the balance sheet of the Company or any Restricted Subsidiary,
     contingent obligations referred to in a footnote or footnotes to financial
     statements and not otherwise reflected on the balance sheet will not be
     deemed to be reflected on such balance sheet for purposes of this clause
     (A), and (B) the maximum assumable liability in respect of such
     Indebtedness shall at no time exceed the gross proceeds including non-cash
     proceeds, the fair market value of such non-cash proceeds being measured at
     the time received and without giving effect to any subsequent changes in
     value, actually received by the Company and/or such Restricted Subsidiary
     in connection with such disposition;
    
 
   
     (f)  the incurrence by the Company or any of its Restricted Subsidiaries of
     Permitted Refinancing Indebtedness in exchange for, or the net proceeds of
     which are used to refund, refinance or replace Indebtedness, other than
     intercompany Indebtedness, that was permitted by the Indenture to be
     incurred;
    
 
                                       27
<PAGE>   31
 
   
     (g)  the incurrence by the Company or any of its Restricted Subsidiaries of
     intercompany Indebtedness between or among the Company and/or any of its
     Restricted Subsidiaries; provided that (i) if the Company is the obligor on
     such Indebtedness, such Indebtedness is expressly subordinated to the prior
     payment in full in cash of all Obligations with respect to the Notes and
     (ii)(A) any subsequent issuance or transfer of Equity Interests that
     results in any such Indebtedness being held by a Person other than the
     Company or a Restricted Subsidiary thereof and (B) any sale or other
     transfer of any such Indebtedness to a Person that is not either the
     Company or a Restricted Subsidiary thereof shall be deemed, in each case,
     to constitute an incurrence of such Indebtedness by the Company or such
     Restricted Subsidiary, as the case may be, that was not permitted by this
     clause (g);
    
 
   
     (h)  the incurrence by the Company or any of its Restricted Subsidiaries of
     Hedging Obligations that are incurred for the purpose of fixing or hedging
     (A) interest rate risk with respect to any floating rate Indebtedness that
     is permitted by the terms of this Indenture to be outstanding and (B)
     exchange rate risk with respect to agreements or Indebtedness of such
     Person payable denominated in a currency other than U.S. dollars, provided
     that such agreements do not increase the Indebtedness of the obligor
     outstanding at any time other than as a result of fluctuations in foreign
     currency exchange rates or interest rates or by reason of fees, indemnities
     and compensation payable thereunder;
    
 
   
     (i)  the guarantee by the Company or any of its Restricted Subsidiaries of
     Indebtedness of the Company or a Restricted Subsidiary of the Company that
     was permitted to be incurred by another provision of this covenant;
    
 
   
     (j)  the incurrence by the Company or any of its Restricted Subsidiaries of
     Acquired Indebtedness in an aggregate principal amount (or accreted value,
     as applicable) not to exceed $25.0 million outstanding after giving effect
     to such incurrence;
    
 
   
     (k)  obligations in respect of performance and surety bonds and completion
     guarantees provided by the Company or any Restricted Subsidiary in the
     ordinary course of business; and
    
 
   
     (l)  the incurrence by the Company or any of its Restricted Subsidiaries of
     additional Indebtedness in an aggregate principal amount (or accreted
     value, as applicable) outstanding after giving effect to such incurrence,
     including all Permitted Refinancing Indebtedness incurred to refund,
     refinance or replace any Indebtedness incurred pursuant to this clause (l),
     not to exceed $50.0 million.
    
 
   
For purposes of determining compliance with this covenant, if an item of
Indebtedness meets the criteria of more than one of the categories of Permitted
Indebtedness described in clauses (a) through (l) above or is entitled to be
incurred pursuant to the first paragraph of this covenant, the Company shall, in
its sole discretion, classify such item of Indebtedness in any manner that
complies with this covenant and such item of Indebtedness will be treated as
having been incurred pursuant to only one of such clauses or pursuant to the
first paragraph hereof. In addition, the Company may, at any time, change the
classification of an item of Indebtedness, or any portion thereof, to any other
clause or to the first paragraph hereof provided that the Company would be
permitted to incur such item of Indebtedness, or such portion thereof, pursuant
to such other clause or the first paragraph hereof, as the case may be, at such
time of reclassification. Accrual of interest, accretion or amortization of
original issue discount will not be deemed to be an incurrence of Indebtedness
for purposes of this covenant.
    
 
                                       28
<PAGE>   32
 
   
All Indebtedness under the New Credit Facility outstanding on the date on which
Notes are first issued and authenticated under the Indenture shall be deemed to
have been incurred on such date in reliance on the first paragraph of the
covenant described under the caption "--Certain Covenants--Incurrence of
Indebtedness and Issuance of Preferred Stock." As a result, the Company will be
permitted to incur significant additional secured indebtedness under clause (a)
of the definition of "Permitted Indebtedness." See "Risk Factors."
    
 
   
LIENS
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, directly or indirectly, create, incur, assume or
suffer to exist any Lien, other than a Permitted Lien, that secures obligations
under any Pari Passu Indebtedness or subordinated Indebtedness of the Company on
any asset or property now owned or hereafter acquired by the Company or any of
its Restricted Subsidiaries, or any income or profits therefrom or assign or
convey any right to receive income therefrom, unless the Notes are equally and
ratably secured with the obligations so secured until such time as such
obligations are no longer secured by a Lien; provided that, in any case
involving a Lien securing subordinated Indebtedness of the Company, such Lien is
subordinated to the Lien securing the Notes to the same extent that such
subordinated Indebtedness is subordinated to the Notes.
    
 
   
DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED SUBSIDIARIES
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or
suffer to exist or become effective any encumbrance or restriction on the
ability of any Restricted Subsidiary to:
    
 
   
     - (i) pay dividends or make any other distributions to the Company or any
       of its Restricted Subsidiaries (A) on its Capital Stock or (B) with
       respect to any other interest or participation in, or measured by, its
       profits, or (ii) pay any Indebtedness owed to the Company or any of its
       Restricted Subsidiaries;
    
 
   
     - make loans or advances to the Company or any of its Restricted
       Subsidiaries; or
    
 
   
     - transfer any of its properties or assets to the Company or any of its
       Restricted Subsidiaries.
    
 
   
However, the foregoing restrictions will not apply to encumbrances or
restrictions existing under or by reason of:
    
 
   
     - Existing Indebtedness as in effect on the date of the Indenture;
    
 
   
     - the New Credit Facility as in effect as of the date of the Indenture, and
       any amendments, modifications, restatements, renewals, increases,
       supplements, refundings, replacements or refinancings thereof;
    
 
   
     - the Indenture and the Notes;
    
 
   
     - applicable law and any applicable rule, regulation or order;
    
 
   
     - any agreement or instrument of a Person acquired by the Company or any of
       its Restricted Subsidiaries as in effect at the time of such acquisition
       (except to the extent created in contemplation of such acquisition),
       which encumbrance or restriction is not applicable to any Person, or the
       properties or assets of any Person,
    
 
                                       29
<PAGE>   33
 
   
       other than the Person, or the property or assets of the Person, so
       acquired, provided that, in the case of Indebtedness, such Indebtedness
       was permitted by the terms of the Indenture to be incurred;
    
 
   
     - customary non-assignment provisions in leases entered into in the
       ordinary course of business and consistent with past practices;
    
 
   
     - purchase money obligations for property acquired in the ordinary course
       of business that impose restrictions of the nature described in the
       second preceding clause above on the property so acquired;
    
 
   
     - contracts for the sale of assets, including customary restrictions with
       respect to a Subsidiary pursuant to an agreement that has been entered
       into for the sale or disposition of all or substantially all of the
       Capital Stock or assets of such Subsidiary;
    
 
   
     - Permitted Refinancing Indebtedness, provided that the restrictions
       contained in the agreements governing such Permitted Refinancing
       Indebtedness are, in the good faith judgment of the Company's board of
       directors, not materially less favorable, taken as a whole, to the
       Holders of the Notes than those contained in the agreements governing the
       Indebtedness being refinanced;
    
 
   
     - secured Indebtedness otherwise permitted to be incurred pursuant to the
       covenants described under "--Incurrence of Indebtedness and Issuance of
       Preferred Stock" and "--Liens" that limit the right of the debtor to
       dispose of the assets securing such Indebtedness;
    
 
   
     - restrictions on cash or other deposits or net worth imposed by customers
       under contracts entered into in the ordinary course of business;
    
 
   
     - other Indebtedness or Disqualified Stock of Restricted Subsidiaries
       permitted to be incurred subsequent to the date of issuance of the Notes
       pursuant to the provisions of the covenant described under "--Incurrence
       of Indebtedness and Issuance of Preferred Stock";
    
 
   
     - customary provisions in joint venture agreements and other similar
       agreements entered into in the ordinary course of business; and
    
 
   
     - restrictions created in connection with any Receivables Facility that, in
       the good faith determination of the board of directors of the Company,
       are necessary or advisable to effect such Receivables Facility.
    
 
   
MERGER, CONSOLIDATION, OR SALE OF ASSETS
    
 
   
The Indenture provides that the Company may not consolidate or merge with or
into, whether or not the Company is the surviving corporation, or sell, assign,
transfer, convey or otherwise dispose of all or substantially all of its
properties or assets in one or more related transactions, to another Person
unless:
    
 
   
     - the Company is the surviving corporation or the Person formed by or
       surviving any such consolidation or merger, if other than the Company, or
       to which such sale, assignment, transfer, conveyance or other disposition
       shall have been made is a corporation organized or existing under the
       laws of the United States, any state thereof or the District of Columbia;
    
 
   
     - the Person formed by or surviving any such consolidation or merger, if
       other than the Company, or the Person to which such sale, assignment,
       transfer, conveyance or
    
 
                                       30
<PAGE>   34
 
   
       other disposition shall have been made assumes all the obligations of the
       Company under the Registration Rights Agreement, the Notes and the
       Indenture pursuant to a supplemental indenture in a form reasonably
       satisfactory to the Trustee;
    
 
   
     - immediately after such transaction no Default or Event of Default exists;
       and
    
 
   
     - the Company or the Person formed by or surviving any such consolidation
       or merger, if other than the Company, or to which such sale, assignment,
       transfer, conveyance or other disposition shall have been made (a) will,
       at the time of such transaction and after giving pro forma effect thereto
       as if such transaction had occurred at the beginning of the applicable
       four-quarter period, be permitted to incur at least $1.00 of additional
       Indebtedness pursuant to the Fixed Charge Coverage Ratio test provided in
       the first paragraph of the covenant described under the caption
       "--Incurrence of Indebtedness and Issuance of Preferred Stock" or (b)
       would, together with its Restricted Subsidiaries, have a higher Fixed
       Charge Coverage Ratio immediately after such transaction (after giving
       pro forma effect thereto as if such transaction had occurred at the
       beginning of the applicable four-quarter period) than the Fixed Charge
       Coverage Ratio of the Company and its Restricted Subsidiaries immediately
       before such transaction.
    
 
   
The foregoing clause will not prohibit:
    
 
   
     - a merger between the Company and a Wholly Owned Subsidiary of Holdings
       created for the purpose of holding the Capital Stock of the Company;
    
 
   
     - a merger between the Company and a Wholly Owned Restricted Subsidiary; or
    
 
   
     - a merger between the Company and an Affiliate incorporated solely for the
       purpose of reincorporating the Company in another State of the United
       States so long as, in each case, the amount of Indebtedness of the
       Company and its Restricted Subsidiaries is not increased thereby.
    
 
   
The Indenture also provides that the Company will not lease all or substantially
all of its assets to any Person.
    
 
   
TRANSACTIONS WITH AFFILIATES
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, make any payment to, or sell, lease, transfer or
otherwise dispose of any of its properties or assets to, or purchase any
property or assets from, or enter into or make or amend any transaction,
contract, agreement, understanding, loan, advance or guarantee with, or for the
benefit of, any Affiliate of the Company, each of the foregoing, an "Affiliate
Transaction", unless:
    
 
   
     (a) such Affiliate Transaction is on terms that are no less favorable to
         the Company or such Restricted Subsidiary than those that would have
         been obtained in a comparable transaction by the Company or such
         Restricted Subsidiary with an unrelated Person and
    
 
   
     (b) the Company delivers to the Trustee, with respect to any Affiliate
         Transaction or series of related Affiliate Transactions involving
         aggregate consideration in excess of $7.5 million, either (i) a
         resolution of the board of directors provided in an Officers'
         Certificate certifying that such Affiliate Transaction complies with
         clause (a) above and that such Affiliate Transaction has been approved
         by a majority of the disinterested members of the board of directors or
         (ii) an opinion as to the fairness to the Holders of such Affiliate
         Transaction from a financial
    
 
                                       31
<PAGE>   35
 
   
         point of view issued by an accounting, appraisal or investment banking
         firm of national standing.
    
 
   
Notwithstanding the foregoing, the following items shall not be deemed to be
Affiliate Transactions:
    
 
   
     - customary directors' fees, indemnification or similar arrangements or any
       employment agreement or other compensation plan or arrangement entered
       into by the Company or any of its Restricted Subsidiaries in the ordinary
       course of business (including ordinary course loans to employees not to
       exceed (a) $5.0 million outstanding in the aggregate at any time and (b)
       $2.0 million to any one employee) and consistent with the past practice
       of the Company or such Restricted Subsidiary;
    
 
   
     - transactions between or among the Company and/or its Restricted
       Subsidiaries;
    
 
   
     - payments of customary fees by the Company or any of its Restricted
       Subsidiaries to DLJMB and its Affiliates made for any financial advisory,
       financing, underwriting or placement services or in respect of other
       investment banking activities, including in connection with acquisitions
       or divestitures which are approved by a majority of the board of
       directors in good faith;
    
 
   
     - any agreement as in effect on the date of the Indenture or any amendment
       thereto, so long as such amendment is not disadvantageous to the Holders
       of the Notes in any material respect, or any transaction contemplated
       thereby;
    
 
   
     - payments and transactions in connection with the Merger, the New Credit
       Facility (including commitment, syndication and arrangement fees payable
       thereunder) and the Original Offerings (including underwriting discounts
       and commissions in connection therewith) and the application of the
       proceeds thereof, and the payment of the fees and expenses with respect
       thereto;
    
 
   
     - Restricted Payments that are permitted by the provisions of the Indenture
       described under the caption "--Restricted Payments";
    
 
   
     - sales of accounts receivable, or participations therein, in connection
       with any Receivables Facility; and
    
 
   
     - transactions pursuant to the Management Loans.
    
 
   
SALE AND LEASEBACK TRANSACTIONS
    
 
   
The Indenture provides that the Company will not, and will not permit any of its
Restricted Subsidiaries to, enter into any sale and leaseback transaction;
provided that the Company or any Restricted Subsidiary may enter into a sale and
leaseback transaction if:
    
 
   
     - the Company or such Restricted Subsidiary, as the case may be, could have
       (a) incurred Indebtedness in an amount equal to the Attributable
       Indebtedness relating to such sale and leaseback transaction pursuant to
       the Fixed Charge Coverage Ratio test shown in the first paragraph of the
       covenant described under the caption "--Incurrence of Indebtedness and
       Issuance of Preferred Stock" and (b) incurred a Lien to secure such
       Indebtedness pursuant to the covenant described under the caption
       "--Liens;"
    
 
   
     - the gross cash proceeds of such sale and leaseback transaction are at
       least equal to the fair market value, as determined in good faith by the
       board of directors and provided in an Officers' Certificate delivered to
       the Trustee, of the property that is the subject of such sale and
       leaseback transaction; and
    
 
                                       32
<PAGE>   36
 
   
     - the transfer of assets in such sale and leaseback transaction is
       permitted by, and the Company applies the proceeds of such transaction in
       compliance with, the covenant described under the caption "Repurchase at
       the Option of Holders--Asset Sales."
    
 
   
NO SENIOR SUBORDINATED INDEBTEDNESS
    
 
   
The Indenture provides that:
    
 
   
     - the Company will not Incur any Indebtedness that is subordinate or junior
       in right of payment to any Senior Indebtedness and senior in right of
       payment to the Notes, and
    
 
   
     - no Guarantor will Incur any Indebtedness that is subordinate or junior in
       right of payment to any Senior Indebtedness and senior in any respect in
       right of payment to the Note Guarantees.
    
 
   
ACCOUNTS RECEIVABLE FACILITY
    
 
   
The Indenture provides that no Accounts Receivable Subsidiary will incur any
Indebtedness if immediately after giving effect to such incurrence the aggregate
outstanding Indebtedness of all Accounts Receivable Subsidiaries, excluding any
Indebtedness owed to the Company or any Restricted Subsidiary, would exceed
$60.0 million.
    
 
   
RESTRICTIONS ON ACTIVITIES OF THERMADYNE CAPITAL
    
 
   
The Indenture provides that Thermadyne Capital may not hold any assets, become
liable for any obligations or engage in any business activities; provided that
Thermadyne Capital may be a co-obligor with respect to Notes issued pursuant to
the Indenture and the Senior Indebtedness and engage in any activities directly
related or necessary in connection therewith.
    
 
   
ADDITIONAL NOTE GUARANTEES
    
 
   
The Indenture provides that, if any Restricted Subsidiary of the Company that is
a Domestic Subsidiary guarantees any Indebtedness under the New Credit Facility,
then such Restricted Subsidiary shall become a Guarantor and execute a
Supplemental Indenture and deliver an Opinion of Counsel, in accordance with the
terms of the Indenture.
    
 
   
REPORTS
    
 
   
The Indenture provides that, whether or not required by the rules and
regulations of the SEC, so long as any Notes are outstanding, the Company will
furnish to the Holders of Notes
    
 
   
     - all quarterly and annual financial information that would be required to
       be contained in a filing with the SEC on Forms 10-Q and 10-K if the
       Company were required to file such Forms, including a "Management's
       Discussion and Analysis of Financial Condition and Results of Operations"
       and, with respect to the annual information only, a report thereon by the
       Company's certified independent accountants and
    
 
   
     - all current reports that would be required to be filed with the SEC on
       Form 8-K if the Company were required to file such reports, in each case,
       within the time periods specified in the SEC's rules and regulations.
    
 
                                       33
<PAGE>   37
 
   
In addition, whether or not required by the rules and regulations of the SEC,
the Company will file a copy of all such information and reports with the SEC
for public availability within the time periods specified in the SEC's rules and
regulations, unless the SEC will not accept such a filing, and make such
information available to securities analysts and prospective investors upon
request. In addition, the Company and the Guarantors have agreed that, for so
long as any Notes remain outstanding, they will furnish to the Holders and to
securities analysts and prospective investors, upon their request, the
information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act.
    
 
   
EVENTS OF DEFAULT AND REMEDIES
    
 
   
The Indenture provides that each of the following constitutes an Event of
Default:
    
 
   
(a) default for 30 days in the payment when due of interest on, or Liquidated
    Damages with respect to, the Notes (whether or not prohibited by the
    subordination provisions of the Indenture);
    
 
   
(b) default in payment when due of the principal of or premium, if any, on the
    Notes (whether or not prohibited by the subordination provisions of the
    Indenture);
    
 
   
(c) failure by the Company or any of its Restricted Subsidiaries for 30 days
    after receipt of notice from the Trustee or Holders of at least 25% in
    principal amount of the Notes then outstanding to comply with the provisions
    described under the captions "Repurchase at the Option of Holders--Change of
    Control," "--Asset Sales," "Certain Covenants--Restricted Payments,"
    "--Incurrence of Indebtedness and Issuance of Preferred Stock" or "Merger,
    Consolidation or Sale of Assets";
    
 
   
(d) failure by the Company for 60 days after notice from the Trustee or the
    Holders of at least 25% in principal amount of the Notes then outstanding to
    comply with any of its other agreements in the Indenture or the Notes;
    
 
   
(e) default under any mortgage, indenture or instrument under which there may be
    issued or by which there may be secured or evidenced any Indebtedness for
    money borrowed by the Company or any of its Restricted Subsidiaries (or the
    payment of which is guaranteed by the Company or any of its Restricted
    Subsidiaries), whether such Indebtedness or guarantee now exists, or is
    created after the date of the Indenture, which default (a) is caused by a
    failure to pay Indebtedness at its stated final maturity (after giving
    effect to any applicable grace period provided in such Indebtedness) (a
    "Payment Default") or (b) results in the acceleration of such Indebtedness
    before its stated final maturity and, in each case, the principal amount of
    any such Indebtedness, together with the principal amount of any other such
    Indebtedness under which there has been a Payment Default or the maturity of
    which has been so accelerated, aggregates $10.0 million or more;
    
 
   
(f) failure by the Company or any of its Restricted Subsidiaries to pay final
    judgments aggregating in excess of $10.0 million, net of any amounts with
    respect to which a reputable and creditworthy insurance company has
    acknowledged liability in writing, which judgments are not paid, discharged
    or stayed for a period of 60 days;
    
 
   
(g) except as permitted by the Indenture, any Note Guarantee shall be held in
    any judicial proceeding to be unenforceable or invalid or shall cease for
    any reason to be in full force and effect or any Guarantor, or any Person
    acting of behalf of any Guarantor, shall deny or disaffirm its obligations
    under its Note Guarantee; and
    
 
                                       34
<PAGE>   38
 
   
(h) certain events of bankruptcy or insolvency with respect to the Company or
    any of its Restricted Subsidiaries that is a Significant Subsidiary.
    
 
   
If any Event of Default occurs and is continuing, the Trustee or the Holders of
at least 25% in principal amount of the then outstanding Notes may declare all
the Notes to be due and payable immediately; provided that, so long as any
Indebtedness permitted to be incurred pursuant to the New Credit Facility shall
be outstanding, such acceleration shall not be effective until the earlier of:
    
 
   
     - an acceleration of any such Indebtedness under the New Credit Facility or
    
 
   
     - five business days after receipt by the Issuers and the administrative
       agent under the New Credit Facility of written notice of such
       acceleration.
    
 
   
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency with respect to the Company or any
Significant Subsidiary, all outstanding Notes will become due and payable
without further action or notice. Holders of the Notes may not enforce the
Indenture or the Notes except as provided in the Indenture. In the event of a
declaration of acceleration of the Notes because an Event of Default has
occurred and is continuing as a result of the acceleration of any Indebtedness
described in clause (e) of the second preceding paragraph, the declaration of
acceleration of the Notes shall be automatically annulled if the holders of any
Indebtedness described in such clause (e) have rescinded the declaration of
acceleration in respect of such Indebtedness within 30 days of the date of such
declaration and if (a) the annulment of the acceleration of the Notes would not
conflict with any judgment or decree of a court of competent jurisdiction and
(b) all existing Events of Default, except non-payment of principal or interest
on the Notes that became due solely because of the acceleration of the Notes,
have been cured or waived.
    
 
   
Subject to certain limitations, Holders of a majority in principal amount of the
then outstanding Notes may direct the Trustee in its exercise of any trust or
power. The Trustee may withhold from Holders of the Notes notice of any
continuing Default or Event of Default (except a Default or Event of Default
relating to the payment of principal or interest) if it determines that
withholding notice is in their interest.
    
 
   
The Holders of a majority in aggregate principal amount of the Notes then
outstanding by notice to the Trustee may on behalf of the Holders of all of the
Notes waive any existing Default or Event of Default and its consequences under
the Indenture except a continuing Default or Event of Default in the payment of
interest on, or the principal of, the Notes.
    
 
   
The Issuers are required to deliver to the Trustee annually a statement
regarding compliance with the Indenture, and the Issuers are required upon
becoming aware of any Default or Event of Default to deliver to the Trustee a
statement specifying such Default or Event of Default.
    
 
   
NO PERSONAL LIABILITY OF MEMBER, DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS
    
 
   
No member, director, officer, employee, incorporator or stockholder of any
Issuer, as such, shall have any liability for any obligations of any Issuer
under the Notes or the Indenture or for any claim based on, in respect of, or by
reason of, such obligations or their creation. Each Holder of Notes by accepting
a Note waives and releases all such liability. The waiver and release are part
of the consideration for issuance of the Notes. Such waiver may not be effective
to waive liabilities under the federal securities laws, and it is the view of
the SEC that such a waiver is against public policy.
    
                                       35
<PAGE>   39
 
   
LEGAL DEFEASANCE AND COVENANT DEFEASANCE
    
 
   
The Issuers may, at their option and at any time, elect to have all of their and
the Guarantors' obligations discharged with respect to the outstanding Notes,
the Note Guarantees and the Indenture ("Legal Defeasance") except for:
    
 
   
     - the rights of Holders of outstanding Notes to receive payments in respect
       of the principal of, premium, if any, and interest and Liquidated
       Damages, if any, on such Notes when such payments are due from the trust
       referred to below;
    
 
   
     - the Issuers' obligations with respect to the Notes concerning issuing
       temporary Notes, registration of Notes, mutilated, destroyed, lost or
       stolen Notes and the maintenance of an office or agency for payment and
       money for security payments held in trust;
    
 
   
     - the rights, powers, trusts, duties and immunities of the Trustee, and the
       Issuers' obligations in connection therewith; and
    
 
   
     - the Legal Defeasance provisions of the Indenture.
    
 
   
In addition, the Issuers may, at their option and at any time, elect to have
their obligations released with respect to certain covenants that are described
in the Indenture ("Covenant Defeasance") and thereafter any omission to comply
with such obligations shall not constitute a Default or Event of Default with
respect to the Notes. In the event Covenant Defeasance occurs, certain events,
not including non-payment, bankruptcy, receivership, rehabilitation and
insolvency events, described under "Events of Default and Remedies" will no
longer constitute an Event of Default with respect to the Notes.
    
 
   
In order to exercise either Legal Defeasance or Covenant Defeasance,
    
 
   
     - the Issuers must irrevocably deposit with the Trustee, in trust, for the
       benefit of the Holders of the Notes, cash in U.S. dollars, non-callable
       Government Securities, or a combination thereof, in such amounts as will
       be sufficient, in the opinion of a nationally recognized firm of
       independent public accountants, to pay the principal of, premium, if any,
       and interest and Liquidated Damages, if any, on the outstanding Notes on
       the stated maturity or on the applicable redemption date, as the case may
       be, and the Issuers must specify whether the Notes are being defeased to
       maturity or to a particular redemption date;
    
 
   
     - in the case of Legal Defeasance, the Issuers shall have delivered to the
       Trustee an opinion of counsel in the United States reasonably acceptable
       to the Trustee confirming that (i) the Issuers has received from, or
       there has been published by, the Internal Revenue Service a ruling or
       (ii) since the date of the Indenture, there has been a change in the
       applicable federal income tax law, in either case to the effect that, and
       based thereon such opinion of counsel shall confirm that, subject to
       customary assumptions and exclusions, the Holders of the outstanding
       Notes will not recognize income, gain or loss for federal income tax
       purposes as a result of such Legal Defeasance and will be subject to
       federal income tax on the same amounts, in the same manner and at the
       same times as would have been the case if such Legal Defeasance had not
       occurred;
    
 
   
     - in the case of Covenant Defeasance, the Issuers shall have delivered to
       the Trustee an opinion of counsel in the United States reasonably
       acceptable to the Trustee confirming that, subject to customary
       assumptions and exclusions, the Holders of the outstanding Notes will not
       recognize income, gain or loss for federal income tax purposes as a
       result of such Covenant Defeasance and will be subject to federal
    
                                       36
<PAGE>   40
 
   
       income tax on the same amounts, in the same manner and at the same times
       as would have been the case if such Covenant Defeasance had not occurred;
    
 
   
     - no Default or Event of Default shall have occurred and be continuing on
       the date of such deposit, other than a Default or Event of Default
       resulting from the borrowing of funds to be applied to such deposit or,
       insofar as Events of Default from bankruptcy or insolvency events are
       concerned, at any time in the period ending on the 123rd day after the
       date of deposit;
    
 
   
     - such Legal Defeasance or Covenant Defeasance will not result in a breach
       or violation of, or constitute a default under, any material agreement or
       instrument, other than the Indenture, to which the Company or any of its
       Subsidiaries is a party or by which the Company or any of its
       Subsidiaries is bound;
    
 
   
     - the Issuers must have delivered to the Trustee an opinion of counsel to
       the effect that, subject to customary assumptions and exclusions, after
       the 123rd day following the deposit, the trust funds will not be subject
       to the effect of Section 547 of the United States Bankruptcy Code or any
       analogous New York State law provision or any other applicable federal or
       New York bankruptcy, insolvency, reorganization or similar laws affecting
       creditors' rights generally;
    
 
   
     - the Issuers must deliver to the Trustee an Officers' Certificate stating
       that the deposit was not made by the Issuers with the intent of
       preferring the Holders of Notes over the other creditors of the Issuers
       with the intent of defeating, hindering, delaying or defrauding creditors
       of the Issuers or others; and
    
 
   
     - the Issuers must deliver to the Trustee an Officers' Certificate and an
       opinion of counsel, which opinion may be subject to customary assumptions
       and exclusions, each stating that all conditions precedent provided for
       relating to the Legal Defeasance or the Covenant Defeasance have been
       complied with.
    
 
   
TRANSFER AND EXCHANGE
    
 
   
A Holder may transfer or exchange Notes in accordance with the Indenture. The
Registrar and the Trustee may require a Holder, among other things, to furnish
appropriate endorsements and transfer documents and the Issuers may require a
Holder to pay any taxes and fees required by law or permitted by the Indenture.
The Issuers are not required to transfer or exchange any Note selected for
redemption. Also, the Issuers are not required to transfer or exchange any Note
for a period of 15 days before a selection of Notes to be redeemed. The
registered Holder of a Note will be treated as the owner of it for all purposes.
    
 
   
AMENDMENT, SUPPLEMENT AND WAIVER
    
 
   
Except as provided in the next two succeeding paragraphs, the Indenture, the
Note Guarantees and the Notes may be amended or supplemented with the consent of
the Holders of at least a majority in principal amount of the Notes then
outstanding (including, without limitation, consents obtained in connection with
a purchase of, or tender offer or exchange offer for, Notes), and any existing
default or compliance with any provision of the Indenture, the Note Guarantees
or the Notes may be waived with the consent of the Holders of a majority in
principal amount of the then outstanding Notes, including consents obtained in
connection with a purchase of, or tender offer or exchange offer for, Notes.
    
 
                                       37
<PAGE>   41
 
   
Without the consent of each Holder affected, an amendment or waiver may not,
with respect to any Notes held by a non-consenting Holder:
    
 
   
     - reduce the principal amount of Notes whose Holders must consent to an
       amendment, supplement or waiver;
    
 
   
     - reduce the principal of or change the fixed maturity of any Note or alter
       the provisions with respect to the redemption of the Notes, other than
       the provisions described under the caption "--Repurchase at the Option of
       Holders";
    
 
   
     - reduce the rate of or change the time for payment of interest on any
       Note;
    
 
   
     - waive a Default or Event of Default in the payment of principal of or
       premium, if any, or interest or Liquidated Damages, if any, on the Notes,
       except a rescission of acceleration of the Notes by the Holders of at
       least a majority in aggregate principal amount of the Notes and a waiver
       of the payment default that resulted from such acceleration;
    
 
   
     - make any Note payable in money other than that stated in the Notes;
    
 
   
     - make any change in the provisions of the Indenture relating to waivers of
       past Defaults;
    
 
   
     - waive a redemption payment with respect to any Note, other than the
       provisions described under the caption "--Repurchase at the Option of
       Holders"; or
    
 
   
     - release any Guarantor from its obligations under its Note Guarantee or
       the Indenture, except in accordance with the terms of the Indenture, or
       (i) make any change in the foregoing amendment and waiver provisions.
    
 
   
Notwithstanding the foregoing, any (a) amendment to or waiver of the covenant
described under the caption "--Repurchase at the Option of Holders--Change of
Control," and (b) amendment to Article 10 of the Indenture, which relates to
subordination, will require the consent of the Holders of at least two-thirds in
aggregate principal amount of the Notes then outstanding if such amendment would
materially adversely affect the rights of Holders of Notes.
    
 
   
Notwithstanding the foregoing, without the consent of any Holder of Notes, the
Issuers, the Guarantors and the Trustee may amend or supplement the Indenture,
the Note Guarantees or the Notes to cure any ambiguity, defect or inconsistency,
to provide for uncertificated Notes in addition to or in place of certificated
Notes, to provide for the assumption of the Issuers' obligations to Holders of
Notes in the case of a merger or consolidation or sale of all or substantially
all of the Issuers' assets, to make any change that would provide any additional
rights or benefits to the Holders of Notes or that does not materially adversely
affect the legal rights under the Indenture of any such Holder, or to comply
with requirements of the SEC in order to effect or maintain the qualification of
the Indenture under the Trust Indenture Act or to provide for additional Note
Guarantees of the Notes.
    
 
   
CONCERNING THE TRUSTEE
    
 
   
The Indenture contains certain limitations on the rights of the Trustee, should
it become a creditor of any Issuer, to obtain payment of claims in certain
cases, or to realize on certain property received in respect of any such claim
as security or otherwise. The Trustee will be permitted to engage in other
transactions; however, if it acquires any conflicting interest it
    
 
                                       38
<PAGE>   42
 
   
must eliminate such conflict within 90 days, apply to the SEC for permission to
continue or resign.
    
 
   
The Holders of a majority in principal amount of the then outstanding Notes will
have the right to direct the time, method and place of conducting any proceeding
for exercising any remedy available to the Trustee, subject to certain
exceptions. The Indenture provides that in case an Event of Default shall occur,
which shall not be cured, the Trustee will be required, in the exercise of its
power, to use the degree of care of a prudent man in the conduct of his own
affairs. Subject to such provisions, the Trustee will be under no obligation to
exercise any of its rights or powers under the Indenture at the request of any
Holder of Notes, unless such Holder shall have offered to the Trustee security
and indemnity satisfactory to it against any loss, liability or expense.
    
 
   
CERTAIN DEFINITIONS
    
 
   
Set forth below are certain defined terms used in the Indenture. Reference is
made to the Indenture for a full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.
    
 
   
"Accounts Receivable Subsidiary" means an Unrestricted Subsidiary of the Company
to which the Company or any of its Restricted Subsidiaries sells any of its
accounts receivable pursuant to a Receivables Facility.
    
 
   
"Acquired Indebtedness" means, with respect to any specified Person,
    
 
   
     - Indebtedness of any other Person existing at the time such other Person
       is merged with or into or became a Subsidiary of such specified Person,
       including Indebtedness incurred in connection with, or in contemplation
       of, such other Person merging with or into or becoming a Subsidiary of
       such specified Person, and
    
 
   
     - Indebtedness secured by a Lien encumbering an asset acquired by such
       specified Person at the time the asset is acquired by such specified
       Person.
    
 
   
"Acquisition" means the acquisition of Thermadyne Holdings by the Principals.
    
 
   
"Additional Notes" means additional Notes issued under the Indenture in
accordance with Sections 2.02 and 4.09 thereof.
    
 
   
"Affiliate" of any specified Person means any other Person which, directly or
indirectly, controls, is controlled by or is under direct or indirect common
control with, such specified Person. For purposes of this definition, "control,"
when used with respect to any Person, means the power to direct the management
and policies of such Person, directly or indirectly, whether through the
ownership of voting securities, by contract or otherwise, and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.
    
 
   
"Asset Sale" means
    
 
   
     - the sale, lease, conveyance, disposition or other transfer (a
       "disposition") of any properties, assets or rights (including by way of a
       sale and leaseback), provided that the sale, lease, conveyance or other
       disposition of all or substantially all of the assets of the Company and
       its Subsidiaries taken as a whole will be governed by the provisions of
       the Indenture described under the caption "--Change of Control" and/or
       the provisions described under the caption "--Merger, Consolidation or
       Sale of Assets" and not by the provisions of the Asset Sale covenant, and
    
 
   
     - the issuance, sale or transfer by the Company or any of its Restricted
       Subsidiaries of Equity Interests of any of the Company's Restricted
       Subsidiaries, in the case of
    
 
                                       39
<PAGE>   43
 
   
       either of the above, whether in a single transaction or a series of
       related transactions (a) that have a fair market value in excess of $5.0
       million or (b) for net proceeds in excess of $5.0 million.
    
 
   
Notwithstanding the foregoing, the following items shall not be deemed to be
Asset Sales:
    
 
   
     - dispositions in the ordinary course of business;
    
 
   
     - a disposition of assets by the Company to a Restricted Subsidiary or by a
       Restricted Subsidiary to the Company or to another Restricted Subsidiary;
    
 
   
     - a disposition of Equity Interests by a Restricted Subsidiary to the
       Company or to another Restricted Subsidiary;
    
 
   
     - the sale and leaseback of any assets within 90 days of the acquisition
       thereof;
    
 
   
     - foreclosures on assets;
    
 
   
     - any exchange of like property pursuant to Section 1031 of the Internal
       Revenue Code of 1986, as amended, for use in a Permitted Business;
    
 
   
     - any sale of Equity Interests in, or Indebtedness or other securities of,
       an Unrestricted Subsidiary;
    
 
   
     - a Permitted Investment or a Restricted Payment that is permitted by the
       covenant described under the caption "--Restricted Payments"; and
    
 
   
     - sales of accounts receivable, or participations therein, in connection
       with any Receivables Facility.
    
 
   
"Attributable Indebtedness" in respect of a sale and leaseback transaction
means, at the time of determination, the present value, discounted at the rate
of interest implicit in such transaction, determined in accordance with GAAP, of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction, including any
period for which such lease has been extended or may, at the option of the
lessor, be extended.
    
 
   
"Capital Expenditure Indebtedness" means Indebtedness incurred by any Person to
finance the purchase or construction or any property or assets acquired or
constructed by such Person which have a useful life or more than one year so
long as:
    
 
   
     - the purchase or construction price for such property or assets is
       included in "addition to property, plant or equipment" in accordance with
       GAAP,
    
 
   
     - the acquisition or construction of such property or assets is not part of
       any acquisition of a Person or line of business and
    
 
   
     - such Indebtedness is incurred within 90 days of the acquisition or
       completion of construction of such property or assets.
    
 
   
"Capital Lease Obligation" means, at the time any determination thereof is to be
made, the amount of the liability in respect of a capital lease that would at
such time be required to be capitalized on a balance sheet in accordance with
GAAP.
    
 
   
"Capital Stock" means
    
 
   
     - in the case of a corporation, corporate stock,
    
 
   
     - in the case of an association or business entity, any and all shares,
       interests, participations, rights or other equivalents, however
       designated of corporate stock,
    
 
                                       40
<PAGE>   44
 
   
     - in the case of a partnership or limited liability company, partnership or
       membership interests, whether general or limited, and
    
 
   
     - any other interest or participation that confers on a Person the right to
       receive a share of the profits and losses of, or distributions of assets
       of, the issuing Person.
    
 
   
"Cash Equivalents" means
    
 
   
     - Government Securities,
    
 
   
     - any certificate of deposit maturing not more than 365 days after the date
       of acquisition issued by, or time deposit of, an Eligible Institution or
       any lender under the New Credit Facility,
    
 
   
     - commercial paper maturing not more than 365 days after the date of
       acquisition of an issuer, other than an Affiliate of the Company, with a
       rating, at the time as of which any investment therein is made, of "A-3"
       or higher, according to Standard & Poor's Ratings Group ("S&P") or "P-2"
       or higher, according to Moody's Investor Services, Inc. ("Moody's") or
       carrying an equivalent rating by a nationally recognized rating agency if
       both of the two named rating agencies cease publishing ratings of
       investments,
    
 
   
     - any bankers acceptances of money market deposit accounts issued by an
       Eligible Institution and
    
 
   
     - any fund investing exclusively in investments of the types described in
       the foregoing clauses.
    
 
   
"Consolidated Cash Flow" means, with respect to any Person for any period, the
Consolidated Net Income of such Person and its Restricted Subsidiaries for such
period plus, to the extent deducted in computing Consolidated Net Income,
    
 
   
     - an amount equal to any extraordinary or non-recurring loss plus any net
       loss realized in connection with an Asset Sale,
    
 
   
     - provision for taxes based on income or profits of such Person and its
       Restricted Subsidiaries for such period,
    
 
   
     - Fixed Charges of such Person for such period,
    
 
   
     - depreciation, amortization (including amortization of goodwill and other
       intangibles) and all other non-cash charges (excluding any such non-cash
       charge to the extent that it represents an accrual of or reserve for cash
       expenses in any future period or amortization of a prepaid cash expense
       that was paid in a prior period) of such Person and its Restricted
       Subsidiaries for such period,
    
 
   
     - net periodic post-retirement benefits,
    
 
   
     - other income or expense net as set forth on the face of such Person's
       statement of operations,
    
 
   
     - expenses and charges of the Company related to the Recapitalization, the
       New Credit Facility and the application of the proceeds thereof which are
       paid, taken or otherwise accounted for within 90 days of the consummation
       of the Merger, and
    
 
   
     - any non-capitalized transaction costs incurred in connection with actual
       or proposed financings, acquisition or divestitures, including financing
       and refinancing fees and
    
 
                                       41
<PAGE>   45
 
   
       costs incurred in connection with the Recapitalization, in each case, on
       a consolidated basis and determined in accordance with GAAP.
    
 
   
Notwithstanding the foregoing, the provision for taxes based on the income or
profits of, the Fixed Charges of, and the depreciation and amortization and
other non-cash charges of, a Restricted Subsidiary of a Person shall be added to
Consolidated Net Income to compute Consolidated Cash Flow only to the extent,
and in the same proportion, that Net Income of such Restricted Subsidiary was
included in calculating the Consolidated Net Income of such Person.
    
 
   
"Consolidated Interest Expense" means, with respect to any Person for any
period, the sum of, without duplication,
    
 
   
     - the interest expense of such Person and its Restricted Subsidiaries for
       such period, on a consolidated basis, determined in accordance with GAAP
       (including amortization of original issue discount, non-cash interest
       payments, the interest component of all payments associated with Capital
       Lease Obligations, imputed interest with respect to Attributable Debt,
       commissions, discounts and other fees and charges incurred in respect of
       letter of credit or bankers' acceptance financings, and net payments, if
       any, pursuant to Hedging Obligations; provided that in no event shall any
       amortization of deferred financing costs be included in Consolidated
       Interest Expense); and
    
 
   
     - the consolidated capitalized interest of such Person and its Restricted
       Subsidiaries for such period, whether paid or accrued; provided, however,
       that Receivables Fees shall be deemed not to constitute Consolidated
       Interest Expense.
    
 
   
Notwithstanding the foregoing, the Consolidated Interest Expense with respect to
any Restricted Subsidiary that is not a Wholly Owned Restricted Subsidiary shall
be included only to the extent, and in the same proportion, that the net income
of such Restricted Subsidiary was included in calculating Consolidated Net
Income.
    
 
   
"Consolidated Net Income" means, with respect to any Person for any period, the
aggregate of the Net Income of such Person and its Restricted Subsidiaries for
such period, on a consolidated basis, determined in accordance with GAAP;
provided that:
    
 
   
     (a) the Net Income (or loss) of any Person that is not a Restricted
         Subsidiary or that is accounted for by the equity method of accounting
         shall be included only to the extent of the amount of dividends or
         distributions paid in cash to the referent Person or a Restricted
         Subsidiary thereof;
    
 
   
     (b) the Net Income (or loss) of any Restricted Subsidiary shall be excluded
         to the extent that the declaration or payment of dividends or similar
         distributions by that Restricted Subsidiary of that Net Income (or
         loss) is not at the date of determination permitted without any prior
         governmental approval, that has not been obtained or, directly or
         indirectly, by operation of the terms of its charter or any agreement,
         instrument, judgment, decree, order, statute, rule or governmental
         regulation applicable to that Restricted Subsidiary;
    
 
   
     (c) the Net Income (or loss) of any Person acquired in a pooling of
         interests transaction for any period before the date of such
         acquisition shall be excluded; and
    
 
   
     (d) the cumulative effect of a change in accounting principles shall be
         excluded.
    
 
                                       42
<PAGE>   46
 
   
"Default" means any event that is or with the passage of time or the giving of
notice or both would be an Event of Default.
    
 
   
"Designated Noncash Consideration" means the fair market value of non-cash
consideration received by the Company or one of its Restricted Subsidiaries in
connection with an Asset Sale that is so designated as Designated Noncash
Consideration pursuant to an Officers' Certificate, showing the basis of the
valuation, executed by the principal executive officer and the principal
financial officer of the Company, less the amount of cash or Cash Equivalents
received in connection with a sale of such Designated Noncash Consideration.
    
 
   
"Disqualified Stock" means any Capital Stock that, by its terms (or by the terms
of any security into which it is convertible, or for which it is exchangeable),
or upon the happening of any event (other than any event solely within the
control of the issuer thereof), matures or is mandatorily redeemable, pursuant
to a sinking fund obligation or otherwise, is exchangeable for Indebtedness
(except to the extent exchangeable at the option of such Person subject to the
terms of any debt instrument to which such Person is a party) or redeemable at
the option of the Holder thereof, in whole or in part, on or before the date on
which the Notes mature; provided that any Capital Stock that would constitute
Disqualified Stock solely because the holders thereof have the right to require
the Company to repurchase such Capital Stock upon the occurrence of a Change of
Control or an Asset Sale shall not constitute Disqualified Stock if the terms of
such Capital Stock provide that the Company may not repurchase or redeem any
such Capital Stock pursuant to such provisions unless such repurchase or
redemption complies with the covenant described under the caption "--Certain
Covenants--Restricted Payments," and provided further that, if such Capital
Stock is issued to any plan for the benefit of employees of the Company or its
Subsidiaries or by any such plan to such employees, such Capital Stock shall not
constitute Disqualified Stock solely because it may be required to be
repurchased by the Company in order to satisfy applicable statutory or
regulatory obligations.
    
 
   
"DLJMB" means DLJ Merchant Banking Partners II, L.P. and its Affiliates.
    
 
   
"Domestic Subsidiary" means a Subsidiary that is organized under the laws of the
United States or any State, district or territory thereof.
    
 
   
"Eligible Institution" means a commercial banking institution that has combined
capital and surplus not less than $100.0 million or its equivalent in foreign
currency, whose short-term debt is rated "A-3" or higher according to S&P or
"P-2" or higher according to Moody's or carrying an equivalent rating by a
nationally recognized rating agency if both of the two named rating agencies
cease publishing ratings of investments.
    
 
   
"Equity Interests" means Capital Stock and all warrants, options or other rights
to acquire Capital Stock, but excluding any debt security that is convertible
into, or exchangeable for, Capital Stock.
    
 
   
"Existing Indebtedness" means Indebtedness of the Company and its Restricted
Subsidiaries, other than Indebtedness under the New Credit Facility, in
existence on the date of the Indenture, until such amounts are repaid.
    
 
   
"Fixed Charges" means, with respect to any Person for any period, the sum,
without duplication, of
    
 
   
     - the Consolidated Interest Expense of such Person for such period in
       accordance with GAAP and
    
 
                                       43
<PAGE>   47
 
   
     - all dividend payments on any series of preferred stock of such Person,
       other than dividends payable solely in Equity Interests that are not
       Disqualified Stock, on a consolidated basis and in accordance with GAAP.
    
 
   
"Fixed Charge Coverage Ratio" means, with respect to any Person for any period,
the ratio of the Consolidated Cash Flow of such Person for such period
(exclusive of amounts attributable to discontinued operations, as determined in
accordance with GAAP, or operations and businesses disposed of prior to the
Calculation Date) to the Fixed Charges of such Person for such period, exclusive
of amounts attributable to discontinued operations, as determined in accordance
with GAAP, or operations and businesses disposed of prior to the Calculation
Date. In the event that the referrent Person or any of its Subsidiaries incurs,
assumes, guarantees or redeems any Indebtedness, other than revolving credit
borrowings, or issues or redeems preferred stock after the commencement of the
period for which the Fixed Charge Coverage Ratio is being calculated but before
the date on which the event for which the calculation of the Fixed Charge
Coverage Ratio is made (the "Calculation Date"), then the Fixed Charge Coverage
Ratio shall be calculated giving pro forma effect to such incurrence,
assumption, guarantee or redemption of Indebtedness, or such issuance or
redemption of preferred stock, as if the same had occurred at the beginning of
the applicable four-quarter reference period. In addition, for purposes of
making the computation referred to above, acquisitions that have been made by
the Company or any of its Subsidiaries, including all mergers or consolidations
and any related financing transactions, during the four-quarter reference period
or subsequent to such reference period and on or before the Calculation Date
shall be calculated to include the Consolidated Cash Flow of the acquired
entities on a pro forma basis after giving effect to cost savings resulting from
employee terminations, facilities consolidations and closings, standardization
of employee benefits and compensation practices, consolidation of property,
casualty and other insurance coverage and policies, standardization of sales and
distribution methods, reductions in taxes other than income taxes and other cost
savings reasonably expected to be realized from such acquisition, as determined
in good faith by an officer of the Company, regardless of whether such cost
savings could then be reflected in pro forma financial statements under GAAP,
Regulation S-X promulgated by the SEC or any other regulation or policy of the
SEC, and without giving effect to clause (c) of the proviso set forth in the
definition of Consolidated Net Income, and shall be deemed to have occurred on
the first day of the four-quarter reference period and Consolidated Cash Flow
for such reference period shall be calculated.
    
 
   
"GAAP" means generally accepted accounting principles set forth in the opinions
and pronouncements of the Accounting Principles Board of the American Institute
of Certified Public Accountants and statements and pronouncements of the
Financial Accounting Standards Board or in such other statements by such other
entity as have been approved by a significant segment of the accounting
profession, which are in effect on the date of the Indenture.
    
 
   
"guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including letters of credit or reimbursement agreements
in respect thereof), of all or any part of any Indebtedness.
    
 
   
"Guarantors" means
    
 
   
     - each of the Domestic Subsidiaries of the Company that is a Restricted
       Subsidiary on the date of the Indenture and
    
 
                                       44
<PAGE>   48
 
   
     - any other Subsidiary that executes a Note Guarantee in accordance with
       the provisions of the Indenture.
    
 
   
"Hedging Obligations" means, with respect to any Person, the obligations of such
Person under
    
 
   
     - interest rate swap agreements, interest rate cap agreements and interest
       rate collar agreements and
    
 
   
     - other agreements or arrangements designed to protect such Person against
       fluctuations in interest rates.
    
 
   
"Holder" means a Person in whose name a Note is registered.
    
 
   
"Indebtedness" means, with respect to any Person, any indebtedness of such
Person in respect of borrowed money or evidenced by bonds, notes, debentures or
similar instruments or letters of credit, or reimbursement agreements in respect
thereof, or banker's acceptances or representing Capital Lease Obligations or
the balance deferred and unpaid of the purchase price of any property or
representing any Hedging Obligations, except any such balance that constitutes
an accrued expense or trade payable, if and to the extent any of the foregoing
Indebtedness, other than letters of credit and Hedging Obligations, would appear
as a liability upon a balance sheet of such Person prepared in accordance with
GAAP, as well as all Indebtedness of others secured by a Lien on any asset of
such Person, whether or not such Indebtedness is assumed by such Person and, to
the extent not otherwise included, the guarantee by such Person of any
Indebtedness of any other Person, provided that Indebtedness shall not include
the pledge by the Company of the Capital Stock of an Unrestricted Subsidiary of
the Company to secure Non-Recourse Debt of such Unrestricted Subsidiary. The
amount of any Indebtedness outstanding as of any date shall be (a) the accreted
value thereof (together with any interest thereon that is more than 30 days past
due), in the case of any Indebtedness that does not require current payments of
interest, and (b) the principal amount thereof, in the case of any other
Indebtedness.
    
 
   
"Investments" means, with respect to any Person, all investments by such Person
in other Persons, including Affiliates, in the forms of direct or indirect loans
(including guarantees by the referent Person of, and Liens on any assets of the
referent Person securing, Indebtedness or other obligations of other Persons),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions for consideration of Indebtedness, Equity
Interests or other securities, together with all items that are or would be
classified as investments on a balance sheet prepared in accordance with GAAP,
provided that an investment by the Company for consideration consisting of
common equity securities of the Company shall not be deemed to be an Investment.
If the Company or any Restricted Subsidiary of the Company sells or otherwise
disposes of any Equity Interests of any direct or indirect Restricted Subsidiary
of the Company such that, after giving effect to any such sale or disposition,
such Person is no longer a Subsidiary of the Company, the Company shall be
deemed to have made an Investment on the date of any such sale or disposition
equal to the fair market value of the Equity Interests of such Restricted
Subsidiary not sold or disposed of in an amount determined as provided in the
final paragraph of the covenant described under the caption "--Restricted
Payments."
    
 
   
"Lien" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind in respect of such asset, whether
or not filed, recorded or otherwise perfected under applicable law, including
any conditional sale or other title
    
 
                                       45
<PAGE>   49
 
   
retention agreement, any lease in the nature thereof, any option or other
agreement to sell or give a security interest in and any filing of or agreement
to give any financing statement under the Uniform Commercial Code (or equivalent
statutes) of any jurisdiction.
    
 
   
"Liquidated Damages" means all liquidated damages then owing pursuant to Section
5 of the Registration Rights Agreement.
    
 
   
"Management Loans" means one or more loans by the Company or Holdings to
officers and/or directors of the Company and any of its Restricted Subsidiaries
to finance the purchase by such officers and directors of common stock of
Holdings; provided, however, that the aggregate principal amount of all such
Management Loans outstanding at any time shall not exceed $5.0 million.
    
 
   
"Merger" means the merger of Mercury Acquisition Corp., a Delaware corporation,
with and into Thermadyne Holdings on or prior to the date of issuance of the
Notes.
    
 
   
"Net Income" means, with respect to any Person, the net income (loss) of such
Person, determined in accordance with GAAP and before any reduction in respect
of preferred stock dividends, excluding, however,
    
 
   
     - any gain (or loss), together with any related provision for taxes on such
       gain (or loss), realized in connection with (a) any Asset Sale (including
       dispositions pursuant to sale and leaseback transactions) or (b) the
       extinguishment of any Indebtedness of such Person or any of its
       Restricted Subsidiaries and
    
 
   
     - any extraordinary or nonrecurring gain (or loss), together with any
       related provision for taxes on such extraordinary or nonrecurring gain
       (or loss).
    
 
   
"Net Proceeds" means the aggregate cash proceeds received by the Company or any
of its Restricted Subsidiaries in respect of any Asset Sale (including any cash
received upon the sale or other disposition of any non-cash consideration
received in any Asset Sale), net of, without duplication,
    
 
   
     - the direct costs relating to such Asset Sale (including legal, accounting
       and investment banking fees, and sales commissions, recording fees, title
       transfer fees and appraiser fees and cost of preparation of assets for
       sale) and any relocation expenses incurred as a result thereof,
    
 
   
     - taxes paid or payable as a result thereof, after taking into account any
       available tax credits or deductions and any tax sharing arrangements,
    
 
   
     - amounts required to be applied to the repayment of Indebtedness, other
       than revolving credit Indebtedness incurred pursuant to the New Credit
       Facility, secured by a Lien on the asset or assets that were the subject
       of such Asset Sale and
    
 
   
     - any reserve established in accordance with GAAP or any amount placed in
       escrow, in either case for adjustment in respect of the sale price of
       such asset or assets until such time as such reserve is reversed or such
       escrow arrangement is terminated, in which case Net Proceeds shall
       include only the amount of the reserve so reversed or the amount returned
       to the Company or its Restricted Subsidiaries from such escrow
       arrangement, as the case may be.
    
 
   
"New Credit Facility" means the Credit Agreement, dated as of May 22, 1998, by
and among the Company and certain of its foreign subsidiaries, Donaldson, Lufkin
& Jenrette Securities Corporation, as arranger, DLJ Capital Funding, Inc., as
syndication agent, and ABN AMRO Bank N.V., Chicago Branch, as administrative
agent, including any related notes, guarantees, collateral documents,
instruments and agreements executed in connec-
    
 
                                       46
<PAGE>   50
 
   
tion therewith, and, in each case, as amended, modified, renewed, refunded,
replaced or refinanced from time to time, including any agreement:
    
 
   
     - extending or shortening the maturity of any Indebtedness incurred
       thereunder or contemplated thereby;
    
 
   
     - adding or deleting borrowers or guarantors thereunder;
    
 
   
     - increasing the amount of Indebtedness incurred thereunder or available to
       be borrowed thereunder, provided that on the date such Indebtedness is
       incurred it would not be prohibited by clause (i) of Section 4.09 of the
       Indenture; or
    
 
   
     - otherwise altering the terms and conditions thereof. Indebtedness under
       the New Credit Facility outstanding on the date on which Notes are first
       issued and authenticated under the Indenture shall be deemed to have been
       incurred on such date in reliance on the first paragraph of Section 4.09
       of the Indenture.
    
 
   
"Non-Recourse Debt" means Indebtedness
    
 
   
     - no default with respect to, which, including any rights that the holders
       thereof may have to take enforcement action against an Unrestricted
       Subsidiary, would permit (upon notice, lapse of time or both) any holder
       of any other Indebtedness of the Company or any of its Restricted
       Subsidiaries to declare a default on such other Indebtedness or cause the
       payment thereof to be accelerated or payable before its stated maturity;
       and
    
 
   
     - as to which the lenders have been notified in writing that they will not
       have any recourse to the stock, other than the stock of an Unrestricted
       Subsidiary pledged by the Company to secure debt of such Unrestricted
       Subsidiary, or assets of the Company or any of its Restricted
       Subsidiaries; provided that in no event shall Indebtedness of any
       Unrestricted Subsidiary fail to be Non-Recourse Debt solely as a result
       of any default provisions contained in a guarantee thereof by the Company
       or any of its Restricted Subsidiaries if the Company or such Restricted
       Subsidiary was otherwise permitted to incur such guarantee pursuant to
       the Indenture.
    
 
   
"Obligations" means any principal, interest, penalties, fees, indemnifications,
reimbursements, damages and other liabilities payable under the documentation
governing any Indebtedness.
    
 
   
"Original Offerings" means the offering of the Notes by the Issuers and the
concurrent offering of senior discount debentures by Thermadyne Holdings.
    
 
   
"Pari Passu Indebtedness" means Indebtedness of the Company that ranks pari
passu in right of payment to the Notes.
    
 
   
"Permitted Business" means any business in which the Company and its Restricted
Subsidiaries are engaged on the date of the Indenture or any business reasonably
related, incidental or ancillary thereto.
    
 
   
"Permitted Investments" means
    
 
   
     (a) any Investment in the Company or in a Restricted Subsidiary of the
         Company,
    
 
   
     (b) any Investment in cash or Cash Equivalents,
    
 
   
     (c) any Investment by the Company or any Restricted Subsidiary of the
         Company in a Person, if as a result of such Investment (i) such Person
         becomes a Restricted Subsidiary of the Company or (ii) such Person is
         merged, consolidated or
    
 
                                       47
<PAGE>   51
 
   
         amalgamated with or into, or transfers or conveys substantially all of
         its assets to, or is liquidated into, the Company or a Wholly Owned
         Restricted Subsidiary of the Company,
    
 
   
     (d) any Investment made as a result of the receipt of non-cash
         consideration from an Asset Sale that was made pursuant to and in
         compliance with the covenant described under the caption "--Repurchase
         at the Option of Holders--Asset Sales,"
    
 
   
     (e) any Investment acquired solely in exchange for Equity Interests, other
         than Disqualified Stock, of the Company,
    
 
   
     (f) any Investment in a Person engaged in a Permitted Business (other than
         an Investment in an Unrestricted Subsidiary) having an aggregate fair
         market value, taken together with all other Investments made pursuant
         to this clause (f) that are at that time outstanding, not to exceed 15%
         of Total Assets at the time of such Investment, with the fair market
         value of each Investment being measured at the time made and without
         giving effect to subsequent changes in value,
    
 
   
     (g) Investments relating to any special purpose Wholly Owned Subsidiary of
         the Company organized in connection with a Receivables Facility that,
         in the good faith determination of the board of directors of the
         Company, are necessary or advisable to effect such Receivables Facility
         and
    
 
   
     (h) the Management Loans.
    
 
   
"Permitted Liens" means
    
 
   
     - Liens on property of a Person existing at the time such Person is merged
       into or consolidated with the Company or any Restricted Subsidiary,
       provided that such Liens were not incurred in contemplation of such
       merger or consolidation and do not secure any property or assets of the
       Company or any Restricted Subsidiary other than the property or assets
       subject to the Liens prior to such merger or consolidation;
    
 
   
     - Liens existing on the date of the Indenture;
    
 
   
     - Liens securing Indebtedness consisting of Capitalized Lease Obligations,
       purchase money Indebtedness, mortgage financings, industrial revenue
       bonds or other monetary obligations, in each case incurred solely for the
       purpose of financing all or any part of the purchase price or cost of
       construction or installation of assets used in the business of the
       Company or its Restricted Subsidiaries, or repairs, additions or
       improvements to such assets, provided that (a) such Liens secure
       Indebtedness in an amount not in excess of the original purchase price or
       the original cost of any such assets or repair, additional or improvement
       thereto, plus an amount equal to the reasonable fees and expenses in
       connection with the incurrence of such Indebtedness, (b) such Liens do
       not extend to any other assets of the Company or its Restricted
       Subsidiaries (and, in the case of repair, addition or improvements to any
       such assets, such Lien extends only to the assets, and improvements
       thereto or thereon, repaired, added to or improved), (c) the Incurrence
       of such Indebtedness is permitted by "--Certain Covenants--Incurrence of
       Indebtedness and Issuance of Preferred Stock" and (d) such Liens attach
       within 365 days of such purchase, construction, installation, repair,
       addition or improvement;
    
 
   
     - Liens to secure any refinancings, renewals, extensions, modification or
       replacements (collectively, "refinancing") (or successive refinancings),
       in whole or in part, of any
    
                                       48
<PAGE>   52
 
   
       Indebtedness secured by Liens referred to in the clauses above so long as
       such Lien does not extend to any other property, other than improvements
       thereto;
    
 
   
     - Liens securing letters of credit entered into in the ordinary course of
       business and consistent with past business practice;
    
 
   
     - Liens on and pledges of the capital stock of any Unrestricted Subsidiary
       securing Non-Recourse Debt of such Unrestricted Subsidiary;
    
 
   
     - Liens securing Indebtedness, including all Obligations, under the New
       Credit Facility; and
    
 
   
     - other Liens securing Indebtedness that is permitted by the terms of the
       Indenture to be outstanding having an aggregate principal amount at any
       one time outstanding not to exceed $50.0 million.
    
 
   
"Permitted Refinancing Indebtedness" means any Indebtedness of the Company or
any of its Restricted Subsidiaries issued in exchange for, or the net proceeds
of which are used to extend, refinance, renew, replace, defease or refund other
Indebtedness of the Company or any of its Restricted Subsidiaries; provided
that:
    
 
   
     - the principal amount, or accreted value, if applicable, of such Permitted
       Refinancing Indebtedness does not exceed the principal amount of, or
       accreted value, if applicable, plus premium, if any, and accrued interest
       on the Indebtedness so extended, refinanced, renewed, replaced, defeased
       or refunded (plus the amount of reasonable expenses incurred in
       connection therewith);
    
 
   
     - such Permitted Refinancing Indebtedness has a final maturity date no
       earlier than the final maturity date of, and has a Weighted Average Life
       to Maturity equal to or greater than the Weighted Average Life to
       Maturity of, the Indebtedness being extended, refinanced, renewed,
       replaced, defeased or refunded; and
    
 
   
     - if the Indebtedness being extended, refinanced, renewed, replaced,
       defeased or refunded is subordinated in right of payment to the Notes,
       such Permitted Refinancing Indebtedness is subordinated in right of
       payment to, the Notes on terms at least as favorable, taken as a whole,
       to the Holders of Notes as those contained in the documentation governing
       the Indebtedness being extended, refinanced, renewed, replaced, defeased
       or refunded.
    
 
   
"Person" means any individual, corporation, partnership, limited liability
company, joint venture, association, joint-stock company, trust, unincorporated
organization or government or agency or political subdivision thereof (including
any subdivision or ongoing business of any such entity or substantially all of
the assets of any such entity, subdivision or business).
    
 
   
"Principals" means DLJMB.
    
 
   
"Public Equity Offering" means any issuance of membership interests by the
Company, other than to Thermadyne Holdings and other than Disqualified Stock, or
common stock or preferred stock by Thermadyne Holdings, other than Disqualified
Stock, that is registered pursuant to the Securities Act, other than issuances
registered on Form S-8 and issuances registered on Form S-4, excluding issuances
of membership interests or common stock pursuant to employee benefit plans of
Thermadyne Holdings or the Company or otherwise as compensation to employees of
the Company or Thermadyne Holdings.
    
 
                                       49
<PAGE>   53
 
   
"Qualified Proceeds" means any of the following or any combination of the
following:
    
 
   
     - cash;
    
 
   
     - Cash Equivalents;
    
 
   
     - assets that are used or useful in a Permitted Business; and
    
 
   
     - the Capital Stock of any Person engaged in a Permitted Business if, in
       connection with the receipt by the Company or any Restricted Subsidiary
       of the Company of such Capital Stock, (a) such Person becomes a
       Restricted Subsidiary of the Company or any Restricted Subsidiary of the
       Company or (b) such Person is merged, consolidated or amalgamated with or
       into, or transfers or conveys substantially all of its assets to, or is
       liquidated into, the Company or any Restricted Subsidiary of the Company.
    
 
   
"Recapitalization" means the Acquisition, the Merger and the Original Offerings.
    
 
   
"Receivables Facility" means one or more receivables financing facilities, as
amended from time to time, pursuant to which the Company or any of its
Restricted Subsidiaries sells its accounts receivable to an Accounts Receivable
Subsidiary.
    
 
   
"Receivables Fees" means distributions or payments made directly or by means of
discounts with respect to any participation interests issued or sold in
connection with, and other fees paid to a Person that is not a Restricted
Subsidiary in connection with, any Receivables Facility.
    
 
   
"Registration Rights Agreement" means the Registration Rights Agreement, dated
as of May 22, 1998, by and among the Issuer and the other parties named on the
signature pages thereof, as such agreement may be amended, modified or
supplemented from time to time, and, with respect to any Additional Notes, one
or more registration rights agreements between the Issuer and the other parties
thereto, as such agreement(s) may be amended, modified or supplemented from time
to time, relating to any rights given by the Issuer to the purchasers of
Additional Notes to register such Additional Notes under the Securities Act.
    
 
   
"Related Party" means, with respect to any Principal,
    
 
   
     - any controlling stockholder or partner of such Principal on the date of
       the Indenture, or
    
 
   
     - any trust, corporation, partnership or other entity, the beneficiaries,
       stockholders, partners, owners or Persons beneficially holding, directly
       or through one or more Subsidiaries, a 51% or more controlling interest
       of which consist of the Principals and/or such other Persons referred to
       in this clause and the immediately preceding clause.
    
 
   
"Restricted Investment" means an Investment other than a Permitted Investment.
    
 
   
"Restricted Subsidiary" of a Person means any Subsidiary of the referent Person
that is not an Unrestricted Subsidiary.
    
 
   
"Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date
hereof.
    
 
   
"Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was
    
 
                                       50
<PAGE>   54
 
   
scheduled to be paid in the original documentation governing such Indebtedness,
and shall not include any contingent obligations to repay, redeem or repurchase
any such interest or principal before the date originally scheduled for the
payment thereof.
    
 
   
"Subsidiary" means, with respect to any Person,
    
 
   
     - any corporation, association or other business entity of which more than
       50% of the total voting power of shares of Capital Stock entitled,
       without regard to the occurrence of any contingency, to vote in the
       election of directors, managers or trustees thereof is at the time owned
       or controlled, directly or indirectly, by such Person or one or more of
       the other Subsidiaries of that Person, or a combination thereof, and
    
 
   
     - any partnership or limited liability company (a) the sole general partner
       or the managing general partner or managing member of which is such
       Person or a Subsidiary of such Person or (b) the only general partners or
       managing members of which are such Person or of one or more Subsidiaries
       of such Person, or any combination thereof.
    
 
   
"Tax Sharing Agreement" means any tax sharing agreement or arrangement between
the Company and Holdings, as the same may be amended from time to time; provided
that in no event shall the amount permitted to be paid pursuant to all such
agreements and/or arrangements exceed the amount the Company would be required
to pay for income taxes were it to file a consolidated tax return for itself and
its consolidated Restricted Subsidiaries as if it were a corporation that was a
parent of a consolidated group.
    
 
   
"Thermadyne Holdings" means Thermadyne Holdings Corporation, a Delaware
corporation, the corporate parent of the Company, or its successors.
    
 
   
"Total Assets" means the total consolidated assets of the Company and its
Restricted Subsidiaries, as shown on the most recent balance sheet (excluding
the footnotes thereto) of the Company.
    
 
   
"Unrestricted Subsidiary" means any Subsidiary, other than Thermadyne Capital,
that is designated by the board of directors as an Unrestricted Subsidiary
pursuant to a board resolution, but only to the extent that such Subsidiary:
    
 
   
     - has no Indebtedness other than Non-Recourse Debt;
    
 
   
     - is not party to any agreement, contract, arrangement or understanding
       with the Company or any Restricted Subsidiary of the Company unless the
       terms of any such agreement, contract, arrangement or understanding are
       no less favorable to the Company or such Restricted Subsidiary than those
       that might be obtained at the time from Persons who are not Affiliates of
       the Company;
    
 
   
     - is a Person with respect to which neither the Company nor any of its
       Restricted Subsidiaries has any direct or indirect obligation (a) to
       subscribe for additional Equity Interests (other than Investments
       described in clause (g) of the definition of Permitted Investments) or
       (b) to maintain or preserve such Person's financial condition or to cause
       such Person to achieve any specified levels, of operating results; and
    
 
   
     - has not guaranteed or otherwise directly or indirectly provided credit
       support for any Indebtedness of the Company or any of its Restricted
       Subsidiaries.
    
 
   
Any such designation by the board of directors shall be evidenced to the Trustee
by filing with the Trustee a certified copy of the board resolution giving
effect to such designation
    
 
                                       51
<PAGE>   55
 
   
and an Officers' Certificate certifying that such designation complied with the
foregoing conditions and was permitted by the covenant described under the
caption entitled "--Certain Covenants--Restricted Payments." If, at any time,
any Unrestricted Subsidiary would fail to meet the foregoing requirements as a
Unrestricted Subsidiary, it shall thereafter cease to be an Unrestricted
Subsidiary for purposes of the Indenture and any Indebtedness of such Subsidiary
shall be deemed to be incurred by a Restricted Subsidiary of the Company as of
such date (and, if such Indebtedness is not permitted to be incurred as of such
date under the covenant described under the caption entitled "--Certain
Covenants--Incurrence of Indebtedness and Issuance of Preferred Stock," the
Company shall be in default of such covenant). The board of directors of the
Company may at any time designate any Unrestricted Subsidiary to be a Restricted
Subsidiary; provided that such designation shall be deemed to be an incurrence
of Indebtedness by a Restricted Subsidiary of the Company of any outstanding
Indebtedness of such Unrestricted Subsidiary and such designation shall only be
permitted if:
    
 
   
     - such Indebtedness is permitted under the covenant described under the
       caption entitled "--Certain Covenants--Incurrence of Indebtedness and
       Issuance Preferred of Stock" and
    
 
   
     - no Default or Event of Default would be in existence following such
       designation.
    
 
   
"Weighted Average Life to Maturity" means, when applied to any Indebtedness at
any date, the number of years obtained by dividing
    
 
   
     - the sum of the products obtained by multiplying (a) the amount of each
       then remaining installment, sinking fund, serial maturity or other
       required payments of principal, including payment at final maturity, in
       respect thereof, by (b) the number of years, calculated to the nearest
       one-twelfth, that will elapse between such date and the making of such
       payment, by
    
 
   
     - the then outstanding principal amount of such Indebtedness.
    
 
   
"Wholly Owned Subsidiary" of any Person means a Subsidiary of such Person all of
the outstanding Capital Stock or other ownership interests of which, other than
directors' qualifying shares, shall at the time be owned by such Person or by
one or more Wholly Owned Subsidiaries of such Person.
    
 
   
"Wholly Owned Restricted Subsidiary" of any Person means a Restricted Subsidiary
of such Person all the outstanding Capital Stock or other ownership interests of
which (other than directors' qualifying shares) shall at the time be owned by
such Person or by one or more Wholly Owned Restricted Subsidiaries of such
Person or by such Person and one or more Wholly Owned Restricted Subsidiaries of
such Person.
    
 
   
BOOK-ENTRY; DELIVERY AND FORM
    
 
   
Except as described in the next paragraph, the Notes are currently represented
by one or more permanent global certificates in definitive, duly registered form
(the "Global Senior Subordinated Notes"). The Global Senior Subordinated Notes
were deposited on the Issue Date with, or on behalf of, DTC and registered in
the name of a nominee of DTC.
    
 
   
The Global Notes. The Issuers expect that pursuant to procedures established by
DTC
    
 
   
     - upon the issuance of the Global Senior Subordinated Notes, DTC or its
       custodian will credit, on its internal system, the principal amount of
       Notes of the individual beneficial interests represented by the Global
       Senior Subordinated Notes to the respective accounts of persons who have
       accounts with such depositary and
    
 
                                       52
<PAGE>   56
 
   
     - ownership of beneficial interests in the Global Senior Subordinated Notes
       will be shown on, and the transfer of such ownership will be effected
       only through, records maintained by DTC or its nominee, with respect to
       interests of persons who have accounts with DTC ("participants") and the
       records of participants, with respect to interests of persons other than
       participants.
    
 
   
Qualified Institutional Buyers ("QIB's") and institutional Accredited Investors
who are not QIB's may hold their interests in the Global Senior Subordinated
Notes directly through DTC if they are participants in such system, or
indirectly through organizations which are participants in such system.
    
 
   
So long as DTC, or its nominee, is the registered owner or holder of the Notes,
DTC or such nominee, as the case may be, will be considered the sole owner or
holder of the Notes represented by such Global Senior Subordinated Notes for all
purposes under the Indenture. No beneficial owner of an interest in the Global
Senior Subordinated Notes will be able to transfer that interest except in
accordance with DTC's procedures.
    
 
   
Payments of the principal of, premium, if any, and interest on, the Global
Senior Subordinated Notes will be made to DTC or its nominee, as the case may
be, as the registered owner thereof. None of the Issuers, the Guarantors, the
Trustee or any Paying Agent will have any responsibility or liability for any
aspect of the records relating to or payments made on account of beneficial
ownership interests in the Global Senior Subordinated Notes or for maintaining,
supervising or reviewing any records relating to such beneficial ownership
interest.
    
 
   
The Issuers expect that DTC or its nominee, upon receipt of any payment of
principal, premium, if any and interest on the Global Senior Subordinated Notes,
will credit participants' accounts with payments in amount proportionate to
their respective beneficial interests in the principal amount of the Global
Notes as shown on the records of DTC or its nominee. The Issuers also expect
that payments by participants to owners of beneficial interests in the Global
Senior Subordinated Notes held through such participants will be governed by
standing instructions and customary practice, as is now the case with securities
held for the accounts of customers registered in the names of nominees for such
customers. Such payments will be the responsibility of the participants.
    
 
   
Transfers between participants in DTC will be effected in the ordinary way
through DTC's same-day funds system in accordance with DTC rules and will be
settled in same day funds. If a holder requires physical delivery of a
Certificated Security for any reason, including to sell Notes to persons in
states which require physical delivery of the Notes, or to pledge such
securities, such holder must transfer its interest in a Global Senior
Subordinated Note, in accordance with the normal procedures of DTC.
    
 
   
DTC has advised the Issuers that it will take any action permitted to be taken
by a holder of Notes, including the presentation of Notes for exchange as
described below, only at the direction of one or more participants to whose
account the DTC interests in the Global Senior Subordinated Notes are credited
and only in respect of such portion of the aggregate principal amount of New
Senior Subordinated Notes as to which such participant or participants has or
have given such direction.
    
 
   
DTC has advised the Issuers as follows: DTC is a limited purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the Uniform
Commercial Code and a "Clearing Agency" registered pursuant to the provisions of
Section 17A of the Securities Exchange Act of 1934. DTC was created to hold
securities for its participants and
    
 
                                       53
<PAGE>   57
 
   
facilitate the clearance and settlement of securities transactions between
participants through electronic book-entry changes in accounts of its
participants, thereby eliminating the need for physical movement of
certificates. Participants include securities brokers and dealers, banks, trust
companies and clearing corporations and certain other organizations. Indirect
access to the DTC system is available to others such as banks, brokers, dealers
and trust companies that clear through or maintain a custodial relationship with
a participant, either directly or indirectly ("indirect participants").
    
 
   
Although DTC has agreed to the foregoing procedures in order to facilitate
transfers of interests in the Global Senior Subordinated Note among participants
of DTC, it is under no obligation to perform these procedures, and these
procedures may be discontinued at any time. None of the Issuers, the Guarantors
nor the Trustee will have any responsibility for the performance by DTC or its
participants or indirect participants of their respective obligations under the
rules and procedures governing their operations.
    
 
   
Certificated Securities. If DTC is at any time unwilling or unable to continue
as a depositary for the Global Senior Subordinated Note and a successor
depositary is not appointed by the Issuer within 90 days, Certificated
Securities will be issued in exchange for the Global Senior Subordinated Notes.
    
 
   
                                 LEGAL MATTERS
    
 
   
The validity of the notes offered hereby have been passed upon for Thermadyne
Mfg. and Thermadyne Capital by Weil, Gotshal & Manges LLP, Dallas, Texas and New
York, New York.
    
 
                                    EXPERTS
 
   
Ernst & Young LLP, independent auditors, have audited our consolidated financial
statements and schedule included in our Annual Report on Form 10-K for the year
ended December 31, 1998, as set forth in their reports, which are incorporated
in this prospectus by reference. Our consolidated financial statements are
incorporated by reference in reliance on their reports, given on their authority
as experts in accounting and auditing.
    
 
                                INDEMNIFICATION
 
   
No officer or director of Thermadyne Mfg. LLC or Thermadyne Capital Corp. shall
have any liability for any obligations of the Issuers under the notes or the
related indenture under the federal securities laws. Insofar as indemnification
for liabilities arising under the Securities Act may be permitted to directors,
officers or persons controlling the Issuers pursuant to the foregoing
provisions, we have been informed that in the opinion of the SEC, such
indemnification is against public policy as expressed in the Securities Act and
is therefore unenforceable.
    
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
   
We have filed the following document with the SEC and are expressly
incorporating it herein by reference:
    
 
   
     1. Annual Report on Form 10-K for the fiscal year ended December 31, 1998
     (File No. 0-23378).
    
 
                                       54
<PAGE>   58
 
   
All documents filed pursuant to Section 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act subsequent to the date of this prospectus and prior to
the termination of the offering of the notes shall be deemed to be incorporated
by reference in this prospectus and to be part hereof from the date of filing of
such documents.
    
 
Copies of the above documents may be obtained upon request without charge from
the Secretary's Department, Thermadyne Holdings Corporation, 101 South Hanley
Road, Suite 300, St. Louis, Missouri 63105 (telephone number (314) 721-5573).
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
   
We are a reporting company under the Securities Exchange Act. We file annual,
quarterly and special reports, proxy statements and other information with the
SEC. You may read and copy any reports, statements and other information we file
at the SEC's Public Reference Room at 450 Fifth Street, N.W., Washington, D.C.
20549. Please call 1-800-SEC-0330 for further information on the Public
Reference Room. Our filings are also available from commercial document
retrieval services and at the web site maintained by the SEC at
http://www.sec.gov.
    
 
                                       55
<PAGE>   59
 
- ------------------------------------------------------
- ------------------------------------------------------
     NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS PROSPECTUS DOES NOT CONSTITUTE AN
OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN
THE SECURITIES TO WHICH IT RELATES OR ANY OFFER TO SELL OR THE SOLICITATION OF
AN OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY OFFER
OR SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION
THAT THERE HAS BEEN NO CHANGE IN THE FACTS SET FORTH IN THIS PROSPECTUS OR IN
THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION
CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                           -------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                       PAGE
                                       ----
<S>                                    <C>
Summary..............................    1
Risk Factors.........................    4
Ratio of Earnings to Fixed Charges...   11
Use of Proceeds......................   11
Plan of Distribution.................   12
Description of the Notes.............   13
Legal Matters........................   54
Experts..............................   54
Indemnification......................   54
Incorporation of Certain Information
  by Reference.......................   54
Where You Can Find More Information..   55
</TABLE>
    
 
- ------------------------------------------------------
- ------------------------------------------------------
 
- ------------------------------------------------------
- ------------------------------------------------------
   
                              THERMADYNE MFG. LLC
    
   
                            THERMADYNE CAPITAL CORP.
    
   
                           9 7/8% SENIOR SUBORDINATED
    
   
                                     NOTES
    
                                    DUE 2008
                           -------------------------
 
                                   PROSPECTUS
                           -------------------------
   
                                 April   , 1999
    
 
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   60
 
                PART II. INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
   
Expenses in connection with this Post-Effective Amendment No. 1 are estimated to
be as follows:
    
 
   
<TABLE>
<S>                                                             <C>
SEC Registration Fee........................................      0
Printing and Engraving Expenses.............................      *
Accounting Fees and Expenses................................      *
Legal Fees and Expenses.....................................      *
Miscellaneous...............................................      *
          Total.............................................      *
</TABLE>
    
 
- ---------------
 
   
* To be supplied by amendment.
    
 
ITEM 15. INDEMNIFICATION OF OFFICERS AND DIRECTORS.
 
Section 145 of the General Corporation Law of the State of Delaware (the "DGCL")
permits a corporation to indemnify any of its directors or officers who was or
is a party, or is threatened to be made a party to any third party proceeding by
reason of the fact that such person is or was a director or officer of the
corporation, against expenses (including attorney's fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by such person in
connection with such action, suit or proceeding, if such person acted in good
faith and in a manner such person reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had no reason to believe that such person's conduct was unlawful.
In a derivative action, i.e., one by or in the right of the corporation, the
corporation is permitted to indemnify directors and officers against expenses
incurred by them in connection with the defense or settlement of an action or
suit if they acted in good faith and in a manner that they reasonably believed
to be in or not opposed to the best interests of the corporation, except that no
indemnification shall be made if such person shall have been adjudged liable to
the corporation, unless and only to the extent that the court in which the
action or suit was brought shall determine upon application that the defendant
directors or officers are fairly and reasonably entitled to indemnity for such
expenses despite such adjudication of liability.
 
   
Article Tenth of the Certificate of Incorporation of Thermadyne Capital Corp.
("Thermadyne Capital") makes mandatory indemnification expressly authorized
under the DGCL for directors of Thermadyne Capital. With respect to officers of
Thermadyne Capital, Article Tenth of Thermadyne Capital's Certificate of
Incorporation provides indemnification to such extent and to such effect as the
Board of Directors shall determine to be appropriate and authorized by Delaware
law.
    
 
   
Section 18-101 of the Delaware Limited Liability Company Act permits a limited
liability company to indemnify any person from and against any end claims,
subject to such standards and restrictions, if any, as are set forth in its
limited liability company agreement.
    
 
   
Article Four of the Limited Liability Company Agreement of Thermadyne Mfg. LLC
("Thermadyne LLC") makes mandatory indemnification expressly authorized for
directors
    
 
                                      II-1
<PAGE>   61
 
   
and officers of Thermadyne LLC to the fullest extent permitted under the DGCL
with respect to a corporation organized under the DGCL.
    
 
   
Insofar as indemnification for liabilities arising under the Securities Act, as
may be permitted to directors, officers and controlling persons of the Company
pursuant to the foregoing provisions, or otherwise, the Company has been advised
that in the opinion of the SEC, such indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable. In the event
that a claim for indemnification against such liabilities, other than the
payment by the Company of expenses incurred or paid by a director, officer or
controlling person thereof in the successful defense of any action, suit or
proceeding, is asserted by a director, officer or controlling person in
connection with the securities being registered, the Company will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question of whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.
    
 
ITEM 16. EXHIBITS.
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
<C>                      <S>
          2.1            -- Agreement and Plan of Merger, dated as of January 20,
                            1998, between Thermadyne Holdings Corporation and Mercury
                            Acquisition Corporation.(1)
          2.2            -- Amendment No. 1 to Agreement and Plan of Merger between
                            Thermadyne Holdings Corporation and Mercury Acquisition
                            Corporation.(2)
          2.3            -- Certificate of Merger of Mercury Acquisition Corporation
                            with and into Thermadyne Holdings Corporation.+
          4.1            -- Indenture, dated May 22, 1998, among Thermadyne Mfg. LLC,
                            Thermadyne Capital Corp., the guarantors named therein
                            and State Street Bank and Trust Company, as Trustee.+
          4.2            -- Form of 9 7/8% Senior Subordinated Notes.+
          4.3            -- A/B Exchange Registration Rights Agreement dated as of
                            May 22, 1998, among Thermadyne Mfg. LLC, Thermadyne
                            Capital Corp., the guarantors named therein and
                            Donaldson, Lufkin & Jenrette Securities Corporation.+
          5.1            -- Opinion of Weil, Gotshal & Manges LLP.+
         12.1            -- Computation of Ratio of Earnings to Fixed Charges.*
         23.1            -- Consent of Ernst & Young LLP, Independent Auditors.*
         23.2            -- Consent of Weil, Gotshal & Manges LLP (included in the
                            opinion filed as Exhibit 5.1).
         25.1            -- Statement of Eligibility and Qualification of IBJ
                            Schroeder Bank & Trust Company, as trustee, under the
                            Indenture listed as Exhibit 4.1 hereto on Form T-1.+
</TABLE>
    
 
- -------------------------
 
 *  Filed herewith.
 
   
 +  Previously filed.
    
 
   
(1) Incorporated by reference to Thermadyne Holdings Corporation's Current
    Report on Form 8-K (File No. 0-23378) filed under Section 12(g) of the
    Securities Exchange Act on January 21, 1998.
    
 
                                      II-2
<PAGE>   62
 
   
(2) Incorporated by reference to Thermadyne Holdings Corporation's Registration
    Statement on Form S-1 (File No. 333-57455) filed on June 19, 1998.
    
 
   
ITEM 17. UNDERTAKINGS.
    
 
   
(a) The undersigned Registrant hereby undertakes:
    
 
   
     (1) To file, during any period in which offers or sales are being made, a
     post-effective amendment to this registration statement to include any
     material information with respect to the plan of distribution not
     previously disclosed in the registration statement or any material change
     to such information in the registration statement to include any material
     information with respect to the plan of distribution not previously
     disclosed in the registration statement or any material change to such
     information in the registration statement:
    
 
   
     (2) That, for the purpose of determining any liability under the Securities
     Act, each such post-effective amendment shall be deemed to be a new
     registration statement relating to the securities offered therein, and the
     offering of such securities at the time shall be deemed to be the initial
     bona fide offering thereof.
    
 
     (3) To remove, from registration by means of a post-effective amendment of
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
   
(b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offerings of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
    
 
   
(c) The undersigned registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report, to security holders that is incorporated by
reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the
    
 
                                      II-3
<PAGE>   63
 
   
Securities Exchange Act of 1934; and, where interim financial information
required to be presented by Article 3 of Regulation S-X is not set forth in the
prospectus, to deliver, or cause to be delivered to each person to whom the
prospectus is sent or given, the latest quarterly report that is specifically
incorporated by reference in the prospectus to provide such interim financial
information.
    
 
                                      II-4
<PAGE>   64
 
                                   SIGNATURES
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, the Co-
Registrants have duly cause this Post-Effective Amendment to be signed on their
behalf by the undersigned, thereunto duly authorized on April 13, 1999.
    
 
   
                                            THERMADYNE MFG. LLC
    
   
                                            THERMADYNE CAPITAL CORP.
    
 
   
                                            By:      /s/ JAMES H. TATE
    
                                               ---------------------------------
                                                         James H. Tate
                                                Senior Vice President and Chief
                                                       Financial Officer
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons on behalf
of the Co-Registrants and in the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                        NAME                                   TITLE               DATE
<C>                                                    <S>                    <C>
 
                /s/ RANDALL E. CURRAN                  Chairman of the        April 13, 1999
- -----------------------------------------------------    Board, President
                  Randall E. Curran                      and Chief Executive
                                                         Officer (principal
                                                         executive officer)
 
                  /s/ JAMES H. TATE                    Director, Senior Vice  April 13, 1999
- -----------------------------------------------------    President and Chief
                    James H. Tate                        Financial Officer
                                                         (principal
                                                         financial and
                                                         accounting officer)
 
                 /s/ PETER T. GRAUER                   Director               April 13, 1999
- -----------------------------------------------------
                   Peter T. Grauer
 
             /s/ WILLIAM F. DAWSON, JR.                Director               April 13, 1999
- -----------------------------------------------------
               William F. Dawson, Jr.
</TABLE>
    
 
                                      II-5
<PAGE>   65
 
   
                                   SIGNATURES
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, the Co-
Registrants have duly caused this Registration Statement to be signed on their
behalf by the undersigned, thereunto duly authorized on April 13, 1999.
    
 
   
                                       C&G SYSTEMS HOLDING, INC.
    
   
                                       MARISON CYLINDER COMPANY
    
   
                                       MECO HOLDING COMPANY
    
   
                                       STOODY COMPANY
    
   
                                       TAG REALTY, INC.
    
   
                                       THERMADYNE CYLINDER COMPANY
    
   
                                       THERMADYNE INDUSTRIES, INC.
    
   
                                       THERMADYNE INTERNATIONAL CORP.
    
   
                                       THERMAL ARC, INC.
    
   
                                       THERMAL DYNAMICS CORP.
    
   
                                       TWECO PRODUCTS, INC.
    
   
                                       VICTOR COYNE INTERNATIONAL, INC.
    
   
                                       VICTOR EQUIPMENT COMPANY
    
   
                                       WICHITA WAREHOUSE CORPORATION
    
   
                                       VICTOR GAS SYSTEMS, INC.
    
 
   
                                       By:         /s/ JAMES H. TATE
    
                                          --------------------------------------
   
                                                      James H. Tate
    
   
                                             Senior Vice President and Chief
    
   
                                                    Financial Officer
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons on behalf
of the Co-Registrants and in the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                        NAME                                   TITLE               DATE
<C>                                                    <S>                    <C>
 
                /s/ RANDALL E. CURRAN                  Chairman of the        April 13, 1999
- -----------------------------------------------------    Board, President
                  Randall E. Curran                      and Chief Executive
                                                         Officer (principal
                                                         executive officer)
 
                  /s/ JAMES H. TATE                    Senior Vice President  April 13, 1999
- -----------------------------------------------------    and Chief Financial
                    James H. Tate                        Officer (principal
                                                         financial and
                                                         accounting officer)
</TABLE>
    
 
                                      II-6
<PAGE>   66
 
   
                                   SIGNATURES
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, the Co-
Registrants have duly caused this Registration Statement to be signed on their
behalf by the undersigned, thereunto duly authorized on April 13, 1999.
    
 
   
                                            COYNE NATURAL GAS
    
   
                                              SYSTEMS, INC.
    
   
                                            MODERN ENGINEERING
    
   
                                              COMPANY, INC.
    
 
   
                                            By:      /s/ JAMES H. TATE
    
   
    
                                               ---------------------------------
   
                                                         James H. Tate
    
   
                                                Senior Vice President and Chief
    
   
                                                       Financial Officer
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                        NAME                                   TITLE               DATE
<C>                                                    <S>                    <C>
 
                /s/ RANDALL E. CURRAN                  Chairman of the        April 13, 1999
- -----------------------------------------------------    Board, President
                  Randall E. Curran                      and Chief Executive
                                                         Officer (principal
                                                         executive officer)
 
                  /s/ JAMES H. TATE                    Director, Senior Vice  April 13, 1999
- -----------------------------------------------------    President and Chief
                    James H. Tate                        Financial Officer
                                                         (principal
                                                         financial and
                                                         accounting officer)
 
             /s/ STEPHANIE N. JOSEPHSON                Director               April 13, 1999
- -----------------------------------------------------
               Stephanie N. Josephson
 
                 /s/ RICHARD G. GAST                   Director               April 13, 1999
- -----------------------------------------------------
                   Richard G. Gast
</TABLE>
    
 
   
    
 
                                      II-7
<PAGE>   67
 
   
                                   SIGNATURES
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, the
Co-Registrant has duly caused this Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized on April 13, 1999.
    
 
   
                                            C & G SYSTEMS, INC.
    
 
   
                                            By:      /s/ JAMES H. TATE
    
                                               ---------------------------------
   
                                                         James H. Tate
    
   
                                                Senior Vice President and Chief
    
   
                                                       Financial Officer
    
 
   
Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                        NAME                                   TITLE               DATE
<C>                                                    <S>                    <C>
 
                /s/ RANDALL E. CURRAN                  Chairman of the        April 13, 1999
- -----------------------------------------------------    Board, President
                  Randall E. Curran                      and Chief Executive
                                                         Officer (principal
                                                         executive officer)
 
                  /s/ JAMES H. TATE                    Director, Senior Vice  April 13, 1999
- -----------------------------------------------------    President and Chief
                    James H. Tate                        Financial Officer
                                                         (principal
                                                         financial and
                                                         accounting officer)
 
             /s/ STEPHANIE N. JOSEPHSON                Director               April 13, 1999
- -----------------------------------------------------
               Stephanie N. Josephson
</TABLE>
    
 
   
    
 
                                      II-8
<PAGE>   68
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
<C>                      <S>
          2.1            -- Agreement and Plan of Merger, dated as of January 20,
                            1998, between Thermadyne Holdings Corporation and Mercury
                            Acquisition Corporation.(1)
          2.2            -- Amendment No. 1 to Agreement and Plan of Merger between
                            Thermadyne Holdings Corporation and Mercury Acquisition
                            Corporation.(2)
          2.3            -- Certificate of Merger of Mercury Acquisition Corporation
                            with and into Thermadyne Holdings Corporation.+
          4.1            -- Indenture, dated May 22, 1998, among Thermadyne Mfg. LLC,
                            Thermadyne Capital Corp., the guarantors named therein
                            and State Street Bank and Trust Company, as Trustee.+
          4.2            -- Form of 9 7/8% Senior Subordinated Notes.+
          4.3            -- A/B Exchange Registration Rights Agreement dated as of
                            May 22, 1998, among Thermadyne Mfg. LLC, Thermadyne
                            Capital Corp., the guarantors named therein and
                            Donaldson, Lufkin & Jenrette Securities Corporation.+
          5.1            -- Opinion of Weil, Gotshal & Manges LLP.+
         12.1            -- Computation of Ratio of Earnings to Fixed Charges.*
         23.1            -- Consent of Ernst & Young LLP, Independent Auditors.*
         23.2            -- Consent of Weil, Gotshal & Manges LLP (included in the
                            opinion filed as Exhibit 5.1).
         25.1            -- Statement of Eligibility and Qualification of IBJ
                            Schroeder Bank & Trust Company, as trustee, under the
                            Indenture listed as Exhibit 4.1 hereto on Form T-1.+
</TABLE>
    
 
- -------------------------
 
 *  Filed herewith.
 
   
 +  Previously filed.
    
 
   
(1) Incorporated by reference to Thermadyne Holdings Corporation's Current
    Report on Form 8-K (File No. 0-23378) filed under Section 12(g) of the
    Securities Exchange Act on January 21, 1998.
    
 
   
(2) Incorporated by reference to Thermadyne Holdings Corporation's Registration
    Statement on Form S-1 (File No. 333-57455) filed on June 19, 1998.
    

<PAGE>   1

                                                                   EXHIBIT 12.1

                              THERMADYNE MFG. LLC
                            THERMADYNE CAPITAL CORP.
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                                 (IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                                                              Eleven
                                                                 Years ended December 31,                  months ended
                                                -------------------------------------------------------    December 31,
                                                   1998           1997          1996           1995           1994    
                                                -----------    -----------   -----------    -----------    -----------
<S>                                             <C>            <C>           <C>            <C>            <C>         
Earnings (loss):
Income (loss) from continuing
  operations before income taxes
  and extraordinary item                        $   (25,054)   $    28,544   $   (63,473)   $  (123,330)   $   (80,805)
Fixed charges                                        58,201         50,031        50,887         48,315         45,364
                                                -----------    -----------   -----------    -----------    -----------
  Earnings (loss)                               $    33,147    $    78,575   $   (12,586)   $   (75,015)   $   (35,441)
                                                ===========    ===========   ===========    ===========    ===========

Fixed charges:
Interest expense                                $    52,545    $    45,325   $    45,655    $    41,269    $    39,124
Amortization of deferred financing                    2,480          1,587         2,711          4,860          4,207
   costs
Rent expense                                          3,176          3,119         2,521          2,186          2,033
                                                -----------    -----------   -----------    -----------    -----------
  Fixed charges                                 $    58,201    $    50,031   $    50,887    $    48,315    $    45,364
                                                ===========    ===========   ===========    ===========    ===========

Ratio of earnings to fixed charges                      0.6            1.6           N/A            N/A            N/A
                                                ===========    ===========   ===========    ===========    ===========
Deficiency of earnings available
  to cover fixed charges                        $   (25,054)           N/A   $   (63,473)   $  (123,330)   $   (80,805)
                                                ===========    ===========   ===========    ===========    ===========
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 23.1



               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


   

We consent to the reference to our firm under the caption "Experts" and to the
use of our reports dated February 22, 1999, with respect to the consolidated
financial statements and schedule of Thermadyne Mfg. LLC in the Form S-3
Registration Statement and related Prospectus of Thermadyne Mfg. LLC and
Thermadyne Capital Corp., to be filed with the Securities and Exchange
Commission on or about April 13, 1999.
    


                                            /s/ ERNST & YOUNG LLP




   

Orange County, California
April 13, 1999
    


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