EXHIBIT 4H

                           FIRST AMENDMENT TO
                     WAIVER AND AMENDMENT AGREEMENT

      This First Amendment to Waiver and Amendment Agreement (the
Amendment) dated as of February 28, 2002 is made and entered into by
and among First Union National Bank, a national banking association,
with an office at Broad and Walnut Streets, Philadelphia, Pennsylvania
19109 (the Bank), Selas Corporation of America, a Pennsylvania
business corporation with offices located at 2034 Limekiln Pike,
Dresher, Pennsylvania 19025  (the Borrower), Selas SAS (formerly
named Selas S.A.), a corporation organized under the laws of France
(Selas SAS), CFR-CECF Fofumi Ripoche, a corporation organized under
the laws of France (CFR); and together with Selas SAS, the European
Subsidiaries), Deuer Manufacturing, Inc., an Ohio business corporation
with offices located at 2985 Springboro West, Dayton, Ohio 45439
(Deuer), Resistance Technology, Inc., a Minnesota business
corporation with offices located at 1260 Red Fox Road, Arden Hills,
Minnesota 55112 (RTI), RTI Export, Inc., a Barbados corporation with
offices located at c/o  2034 Limekiln Pike, Dresher, Pennsylvania 19025
(RTIE), and RTI Electronics, Inc., a Delaware corporation with
offices located at 1800 Via Burton Street, Anaheim, California 92806
(RTI Electronics; and together with Deuer, RTI and RTIE, the
Guarantors).

                             BACKGROUND

      A.   The Bank, the Borrower and the  Guarantors  entered into that
certain  Amended  and  Restated  Credit  Agreement  dated as of July 31,
1998,  as amended by an  Amendment  dated as of June 30,  1999, a Second
Amendment  dated as of July 7,  2000 and a Third  Amendment  dated as of
January  19, 2001 (as  amended,  the  "Credit  Agreement"),  pursuant to
which  the  Bank  made  certain  term  loans to the  Borrower  described
therein (the Term Loans) and agreed to make  available to the Borrower
a revolving  credit  facility in the  principal  amount of Four  Million
Five Hundred Thousand Dollars ($4,500,000) (the Revolving Credit).

      B.   The  Guarantors  jointly and severally  guaranteed and became
surety  for  all  loans,  advances,  debts,  liabilities,   obligations,
covenants  and  duties  of the  Borrower  to the  Bank  pursuant  to the
following agreements  (collectively,  the Borrower Surety Agreements):
(i) that certain Guaranty and Suretyship  Agreement of Deuer dated as of
October  20,  1993 and  amended  as of July 31,  1998 (as  amended,  the
Deuer Surety  Agreement),  (ii) that certain  Guaranty and  Suretyship
Agreement  of RTI dated as of October  20,  1993 and  amended as of July
31, 1998 (as amended,  the RTI Surety  Agreement),  (iii) that certain
Guaranty and  Suretyship  Agreement of RTIE dated as of October 20, 1993
and  amended  as  of  July  31,  1998  (as  amended,  the  RTIE  Surety
Agreement),  and (iv) that certain  Guaranty and  Suretyship  Agreement
of RTI  Electronics  dated as of February 20, 1997,  as amended July 31,
1998 (as amended, the RTI Electronics Surety Agreement).



      C.   The Term  Loans are  evidenced  by the  following  promissory
notes  executed  by the  Borrower  in  favor  of  the  Bank,  which  are
outstanding as of the date hereof:  (i) Term Note D dated as of June 30,
1999 in the original  principal  amount of Nine Hundred Thousand Dollars
($900,000)  (Term  Note D),  (ii) Term Note E dated as of January  19,
2001  in  the  original   principal   amount  of  Two  Million   Dollars
($2,000,000)  (Term Note E), and (iii) Term Note F dated as of January
19, 2001 in the original  principal  amount of One Million Seven Hundred
Thousand  Singapore Dollars  (Singapore  $1,700,000) (Term Note F; and
together  with  Term  Note D and Term  Note E, the  Term  Notes).  The
Revolving  Credit  facility  is  evidenced  by an Amended  and  Restated
Revolving  Credit  Note dated as of January  19,  2001 in the  principal
amount  of Four  Million  Five  Hundred  Thousand  Dollars  ($4,500,000)
between the Borrower and the Bank (the  Revolving  Credit  Note).  The
Term Notes and the Revolving  Credit Note are  collectively  referred to
hereinafter as the Notes.

      D.   First Union National Bank,  London Branch  (London  Branch)
and Selas SAS, a subsidiary of the  Borrower,  entered into that certain
Agreement  dated  as of  February  2,  2001  (the  Selas  SAS  Facility
Agreement)  pursuant  to  which  the  Bank  provided  to  Selas  SAS  a
discretionary  line  of  credit  facility  in the  aggregate  amount  of
Sixteen Million Euros  (E16,000,000)  on an on demand basis,  expiring
on April  30,  2001 (the  Selas  SAS  Facility)  for the  purposes  of
providing:  discretionary  advance payment guarantees on behalf of Selas
SAS (the APG  Facility);  and a discretionary  overdraft  facility for
general working capital  purposes with a sub-limit amount of Two Million
Euros   (E2,000,000)   that  was   later   increased   (the   Overdraft
Facility).  The London  Branch and Selas SAS also  entered into certain
term  loan   agreements   (collectively,   the   Selas  SAS  Term  Loan
Agreements),  as follows: an agreement dated February 26, 1998 pursuant
to  which  the  Bank  made a term  loan  to  Selas  SAS in the  original
principal  amount of Fifteen Million French Francs (FF 15,000,000)  (the
Selas SAS 1998 Term Loan  Agreement);  and an agreement  dated January
2000  pursuant  to which  the Bank  made a term loan to Selas SAS in the
original  principal  amount of One Million Seven Hundred and Fifty-Three
Thousand One Hundred and  Fifty-Eight  and 30/100 Euros  (E1,753,158.30)
(the Selas SAS 2000 Term Loan Agreement).

      E.   The Borrower and Guarantors jointly and severally  guaranteed
and  became  surety  for  all  loans,  advances,   debts,   liabilities,
obligations,  covenants and duties of Selas SAS to the Bank, pursuant to
the following agreements (the Selas SAS Surety  Agreements):  (i) that
certain  Unconditional  Guaranty  of  Borrower  dated as of January  10,
2000  (the  Borrower   Guaranty),   (ii)  that  certain  Unconditional
Guaranty of Deuer  dated as of January 10, 2000 (the Deuer  Guaranty),
(iii) that  certain  Unconditional  Guaranty  of RTI dated as of January
10, 2000 (the RTI Guaranty),  (iv) that certain Unconditional Guaranty
of RTIE dated as of January  10,  2000 (the  RTIE  Guaranty),  and (v)
that  certain  Unconditional  Guaranty  of RTI  Electronics  dated as of
January 10, 2000 (the RTI Electronics Guaranty).



      F.   As security  for any and all  indebtedness,  liabilities  and
obligations  of the Borrower to the Bank,  then  existing or  thereafter
arising,  the Borrower:  (i) granted to the Bank a security  interest in
and lien on: (a) all of the Borrowers assets,  then owned or thereafter
acquired,  including, without limitation, all accounts, contract rights,
inventory, fixtures, machinery,  equipment, general intangibles, and (b)
all of  Borrowers  rights  under a  certain  contract  with  Production
Machinery  Corporation  in  Talcahuano,  Chile  for the  sale of and the
proceeds of a Five Million  Twenty-Five  Thousand  Dollars  ($5,025,000)
documentary  letter  of  credit  issued  by  Bank  One,  Columbus,  Ohio
pursuant  to that  certain  Security  Agreement  dated as of October 20,
1993,  as amended  July 31, 1998  between the  Borrower and the Bank (as
amended, the Borrower Security Agreement);  (ii) assigned, pledged and
granted  to  Bank  a  security   interest  in  all  of  the  issued  and
outstanding  stock of Deuer,  RTI, RTIE and RTI Electronics  pursuant to
that certain Second Amended and Restated  Pledge  Agreement  dated as of
July 31, 1998 (the Borrower  Pledge  Agreement);  and (iii) granted to
the Bank a first  mortgage lien on certain real property of the Borrower
and  improvements  thereon  located in Dresher,  Upper Dublin  Township,
Montgomery County,  Pennsylvania (the Pennsylvania  Property) pursuant
to that  certain  First  Mortgage  and  Security  Agreement  dated as of
October 20, 1993, as amended on July 21, 1995,  February 20, 1997,  July
31, 1998 and January 10, 2000 (as amended,  the  Borrower  Mortgage and
Security Agreement).

      G.   As security  for any and all  indebtedness,  liabilities  and
obligations of Deuer to the Bank,  then existing or thereafter  arising,
Deuer:  (i)  granted to the Bank a security  interest in and lien on all
of  Deuers  assets,  then  owned  or  thereafter  acquired,  including,
without limitation, all accounts, contract rights, inventory,  fixtures,
machinery,  equipment,  general  intangibles  pursuant  to that  certain
Security  Agreement  dated as of October 20,  1993,  as amended July 31,
1998  between  Deuer  and the  Bank (as  amended,  the  Deuer  Security
Agreement);  and  (ii)  granted  to the Bank a first  mortgage  lien on
certain  real  property  of Deuer and  improvements  thereon  located in
Moraine,  Montgomery County, Ohio (the Ohio Property) pursuant to that
certain First  Mortgage and Security  Agreement  dated as of October 20,
1993, as amended July 21, 1995,  February 20, 1997,  July 31, 1998,  and
January  10,  2000  (as  amended,   the  Deuer  Mortgage  and  Security
Agreement).

      H.   As security  for any and all  indebtedness,  liabilities  and
obligations  of RTI to the Bank,  then existing or  thereafter  arising,
RTI:  (i) granted to the Bank a security  interest in and lien on all of
RTIs assets,  then owned or  thereafter  acquired,  including,  without
limitation,   all  accounts,   contract  rights,  inventory,   fixtures,
machinery,  equipment,  general  intangibles  pursuant  to that  certain
Security  Agreement  dated as of October 20,  1993,  as amended July 31,
1998  between  RTI  and  the  Bank  (as  amended,   the  RTI   Security
Agreement);  (ii)  granted to the Bank a security  interest in and lien
on  certain  patents  and  trademarks  and other  intellectual  property
pursuant  to that  certain  Patent and  Trademark  Security  dated as of
October 20,  1993,  as amended  July 31,  1998  between RTI and the Bank
(the RTI Patent and Trademark Security  Agreement);  and (iii) granted
to the Bank a first  mortgage  lien on certain real  property of RTI and
improvements   thereon   located  in  Ramsey   County,   Minnesota  (the
Minnesota  Property)  pursuant  to  that  certain  Mortgage,  Security
Agreement and Fixture Financing  Statement dated as of June 30, 1999, as
amended  January 10, 2000 (as  amended,  the RTI  Mortgage and Security
Agreement).

      I.   As security  for any and all  indebtedness,  liabilities  and
obligations  of RTIE to the Bank,  then existing or thereafter  arising,
RTIE  granted to the Bank a security  interest in all of RTIEs  assets,
then owned or thereafter acquired,  including,  without limitation,  all
accounts, contract rights, inventory,  fixtures,  machinery,  equipment,
general  intangibles  pursuant to that certain Security  Agreement dated
as of October 20,  1993,  as amended  July 31, 1998 between RTIE and the
Bank (as amended, the RTIE Security Agreement).

      J.   As security  for any and all  indebtedness,  liabilities  and
obligations of RTI  Electronics to the Bank, then existing or thereafter
arising,  RTI Electronics granted the Bank a security interest in all of
RTI Electronics assets, then owned or thereafter  acquired,  including,
without limitation, all accounts, contract rights, inventory,  fixtures,
machinery,  equipment,  general  intangibles  pursuant  to that  certain
Security  Agreement  dated as of October 20, 1993,  as amended  February
20, 1997 and July 31,  1998  between  RTI  Electronics  and the Bank (as
amended, the RTI Electronics Security Agreement).



      K.   The Borrower,  the Guarantors,  and the European Subsidiaries
entered into that certain  Waiver and  Amendment  Agreement  dated as of
November 20, 2001 (the Waiver  Agreement),  pursuant to which the Bank
agreed  to  waive  certain  Financial   Covenant  Defaults  (as  defined
therein) and provide a new credit facility  pursuant to which the Banks
London Branch agreed to issue certain advance payment guarantees.

      J.   The Waiver Agreement,  the Credit  Agreement,  the Notes, the
Borrower Surety Agreements,  the Selas SAS Facility Agreement, the Selas
SAS Term Loan Agreements,  the Selas SAS Surety Agreements, the Borrower
Security  Agreement,   the  Borrower  Pledge  Agreement,   the  Borrower
Mortgage and  Security  Agreement,  the Deuer  Security  Agreement,  the
Deuer Mortgage and Security Agreement,  the RTI Security Agreement,  the
RTI  Patent and  Trademark  Security  Agreement,  the RTI  Mortgage  and
Security  Agreement,  the RTIE Security  Agreement,  the RTI Electronics
Security Agreement,  together with the various  agreements,  instruments
and other documents executed in connection  therewith and all amendments
and  modifications  thereto,  now  or  hereafter  in  effect,  shall  be
referred to hereinafter as the Loan Documents.

      K.   The Bank,  the  Borrower,  the  Guarantors,  and the European
Subsidiaries,  pursuant  to the terms  hereof,  wish to amend the Credit
Agreement, as provided herein.

      NOW,  THEREFORE,  incorporating the Background by reference herein
and for other good and valuable  consideration,  the Bank, the Borrower,
the Guarantors,  and the European  Subsidiaries  intending to be legally
bound hereby, agree as follows:

                       ARTICLE I - DEFINED TERMS

      1.1  Defined Terms.  Terms used herein which are  capitalized  but
not defined  shall have the meanings  ascribed to such terms in the Loan
Documents, as amended hereby.

                  ARTICLE II - AMENDMENT; COVENANTS

      2.1  Amendment of the Definition of Revolving Credit  Termination
Date.  The  following  definition  in the  Credit  Agreement  is  hereby
amended, restated and replaced as follows:

      Revolving  Credit  Termination  Date is hereby amended to mean
      the  earlier of (i) March 20,  2002 (as such date may be  extended
      from time to time in  accordance  with Section 2.8 hereof) or (ii)
      the date on which the  Revolving  Credit  Commitment is terminated
      pursuant to Section 9.2 hereof.

      2.2  Covenants.  The  Borrower  shall  provide  to the  Bank on or
before March 8, 2002, a detailed  cash flow  projection;  and a complete
and  detailed  description  of the  purpose and use of funds in order to
have considered any request for additional borrowing.

                      ARTICLE III - REAFFIRMATION



      The Borrower,  the  Guarantors and the European  Subsidiaries  (i)
acknowledge  and consent to the terms and  conditions  set forth in this
Amendment,  (ii) hereby ratify, affirm and reaffirm in all respects each
and  all of the  Loan  Documents,  including,  without  limitation,  all
terms, conditions,  representations and covenants contained therein, and
(iii) acknowledge the continued  existence,  validity and enforceability
of the Loan  Documents,  and acknowledge and agree that the Bank holds a
perfected  security  interest in the Collateral to secure the Borrower's
Obligations and agrees that the terms,  conditions,  representations and
covenants contained in the Security Agreement are binding upon it.

              ARTICLE IV - REPRESENTATIONS AND WARRANTIES

      To induce the Bank to enter into this Amendment, the Borrower,
the Guarantors and the European Subsidiaries make the following
representations and warranties to the Bank, each and all of which shall
survive the execution and delivery of this Amendment:

      4.1  No violation of applicable laws.  The execution, delivery
and performance by the Borrower, the Guarantors and the European
Subsidiaries of this Amendment are within their corporate powers, have
been duly authorized by all necessary action taken by their duly
authorized officers and, if necessary, by making appropriate filings
with any governmental agency or unit and are the legal, binding, valid
and enforceable obligations of the Borrower, the Guarantors and the
European Subsidiaries; and do not (i) contravene, or constitute (with
or without the giving of notice or lapse of time or both) a violation
of any provision of applicable law, a violation of the organizational
documents of  the Borrower, the Guarantors and the European
Subsidiaries or a default under any agreement, judgment, injunction,
order, decree or other instrument binding upon or affecting the
Borrower, the Guarantors and the European Subsidiaries, (ii) result in
the creation or imposition of any lien on any of their assets (other
than liens in favor of the Bank) or (iii) give cause for the
acceleration of any obligations of the Borrower, the Guarantors or the
European Subsidiaries to any other creditor.

      4.2  Due Authorization.  Each person executing this Amendment on
behalf of the Borrower, the Guarantors and/or the European Subsidiaries
is duly authorized by such respective entity to execute same.

      4.3  Enforceability.  This Amendment will be, the legal, valid
and binding obligation of the Borrower, the Guarantors and the European
Subsidiaries, enforceable against them in accordance with their
respective terms, subject only to bankruptcy, insolvency,
reorganization, moratorium or other laws or equitable principles
affecting creditors' rights generally.

      4.4  Compliance with Applicable Laws.  The Borrower is in
compliance in all material respects with all laws (including all
applicable environmental laws), regulations, and requirements
applicable to its business and has not received, and has no knowledge
of, any order or notice of any governmental investigation or of any
violation or claim of violation of any law, regulation or other
governmental requirement which would have a material adverse effect
upon its business operations or financial condition.

      4.5  Failure of Conditions.  The Borrower has failed to satisfy
the conditions precedent for issuance of Advance Payment Guarantees as
disclosed on Exhibit 4.5 hereto.

       4.6 Representation and Warranties.  All representations and
warranties made by the Borrower in the Loan Documents are true and
correct as of the date of this Amendment as if such representations and
warranties have been made on the date hereof.



                   ARTICLE V - CONDITIONS TO CLOSING

      Conditions Precedent to Enforceability of This Amendment.  This
Amendment shall be deemed effective only after the occurrence of the
following events:

      5.1  Execution of Amendment.  The Borrower's, Guarantors and
European Subsidiaries execution and delivery to the Bank of this
Amendment; and

      5.2  Fees and Costs.  The Borrower's payment to the Bank of an
amount sufficient to cover all of the Bank's reasonable costs and
expenses to date, including, without limitation, the Bank's reasonable
costs and expenses incurred in connection with the preparation and
negotiation of this Amendment (including the fees and expenses of the
Bank's counsel) through the date of this Amendment.

                       ARTICLE VI - MISCELLANEOUS

      6.1  Continuing Effect.  Except as amended hereby, all of the
Loan Documents shall remain in full force and effect and bind and inure
to the benefit of the parties thereto and are hereby ratified and
confirmed.

      6.2  No Waiver.  Except as expressly provided in the Waiver
Agreement, the Bank has not waived and does not waive any defaults or
Events of Default, now or hereafter existing, whether known or unknown;
and the Bank hereby reserves and preserves any and all rights and
remedies available to it under the Loan Documents with respect to any
such defaults or Events of Default.

      6.3  Counterparts; Effectiveness.  This Amendment may be executed
by facsimile signatures and in any number of counterparts and by the
different parties on separate counterparts, and each such counterpart
shall be deemed to be an original, but all such counterparts shall
together constitute one and the same Amendment.  This Amendment shall
be deemed to have been executed and delivered when the Bank has
received facsimile counterparts hereof executed by all parties listed
on the signature pages hereto.

      6.4  Governing Law.  This Amendment shall be governed and
construed in accordance with the laws of the Commonwealth of
Pennsylvania.

      6.5  Integration.  This Amendment contains the entire agreement
between the parties hereto with respect to the subject matter hereof
and may not be modified or changed in any way except in writing signed
by all parties.


      IN WITNESS WHEREOF, the undersigned have caused this Amendment to
be executed by their duly authorized officers on the date first above
written.

ATTEST:                   FIRST UNION NATIONAL BANK


                          By:        /s/ Kathleen M.
Hedrick
                             Name:  Kathleen M. Hedrick
                             Title: Vice President


                          SELAS CORPORATION OF
                             AMERICA

                          By:       /s/  Francis A.
Toczylowski
                             Name:  Francis A. Toczylowski
                             Title: Vice President, Treasurer &
                             Secretary


                          SELAS SAS


                          By:       /s/  Christian Bailliart
                             Name:  Christian Bailliart
                             Title: President


                           CFR-CECF FOFUMI RIPOCHE


                          By:       /s/  Christian Bailliart
                             Name:  Christian Bailliart
                             Title: President


                          DEUER MANUFACTURING, INC.


                          By:       /s/  Francis A.
Toczylowski
                             Name:  Francis A. Toczylowski
                             Title: Vice President, Treasurer &
                             Secretary



                          RESISTANCE TECHNOLOGY, INC.,


                          By:       /s/  Francis A.
Toczylowski
                             Name:  Francis A. Toczylowski
                             Title: Vice President, Treasurer &
                             Secretary


                          RTI EXPORT, INC.


                          By:       /s/  Francis A.
Toczylowski
                             Name:  Francis A. Toczylowski
                             Title: Vice President, Treasurer &
                             Secretary

                          RTI ELECTRONICS, INC.


                          By:       /s/  Francis A.
Toczylowski
                             Name:  Francis A. Toczylowski
                             Title: Vice President, Treasurer &
                             Secretary





                              Exhibit 4.5

      Pursuant to Section 4.2.2(d) of the Waiver Agreement, on February
28, 2002, the Borrower, the Guarantors and Selas SAS are required to
repay amounts outstanding as necessary to reduce the Overdraft Facility
to an amount not greater than E4,650,000 Euros.  As of the date hereof,
the Overdraft Facility has a balance of approximately E6,000,000 Euros
and the Borrower, the Guarantors and Selas SAS have indicated an
inability to make the necessary payment to reduce the Overdraft
Facility to the required level.

      Pursuant to Section 4.2.2(e) of the Waiver Agreement, on or
before February 28, 2002, the Borrower is required to provide the Bank
with a written certification that the 2001 fourth quarter pre-tax
losses, if any, for the Borrower, the Guarantors, Selas SAS, CFR, and
their affiliates, on a consolidated basis are not more than $200,000.
The Borrower has indicated that the consolidated 2001 fourth quarter
pre-tax losses exceed $200,000.

      Pursuant to Section 4.2.2(f) of the Waiver Agreement, the
Borrower is required to provide the Bank with a copy of a written offer
to purchase Selas SAS on or before February 28, 2002.  The Borrower has
indicated an ability to obtain such an offer.