ERC INDUSTRIES INC /DE/
SC 13D/A, 1996-03-13
OIL & GAS FIELD MACHINERY & EQUIPMENT
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 6)*

                              ERC Industries, Inc.
                               (Name of Issuer)
 
                    Common Stock, par value $0.01 per share
                        (Title of Class of Securities)
 
                                   268912102
                                (CUSIP Number)
 
                  Marc H. Folladori, Haynes and Boone, L.L.P.
            1000 Louisiana Street, Suite 4300, Houston, Texas 77002
                                (713) 547-2000

                    (Name, Address and Telephone Number of 
           Person Authorized to Receive Notices and Communications)
 
                                 March 5, 1996
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box / /.

Check the following box if a fee is being paid with the statement / /. (A fee is
not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
 
                                 SCHEDULE 13D

- -----------------------                                  ---------------------
  CUSIP NO. 268912102                                      PAGE 2 OF 18 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
         John Wood Group PLC, a company registered in Scotland and
         incorporated under the laws of the United Kingdom
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS 
 4    
         WC

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OR LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
      ITEMS 2(d) OR 2(e)
 5    

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
         United Kingdom

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            7,318,686
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             7,318,686
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
         7,318,686

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                  
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
13    
         52.8%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
         CO

- ------------------------------------------------------------------------------
<PAGE>
 
Item 1. Security and Issuer.

  Item 1 is hereby amended and restated in its entirety by the following
  paragraph:

       "This Statement relates to the Common Stock, $0.01 par value (the "Common
  Stock") of ERC Industries, Inc., a Delaware corporation ("New ERC").  New ERC
  was formerly known as ERC Subsidiary, Inc. and is a successor by merger to ERC
  Industries, Inc., a Delaware corporation (referred to herein as "Old ERC").
  The address of the principal executive offices of New ERC is 2906 Holmes Road,
  Houston, Texas 77051.  Old ERC and New ERC are sometimes referred to herein
  generally as the "Company."


  Item 2. Identity and Background.

  Item 2 is hereby amended and restated in its entirety by the following
  paragraphs:

       "The person filing this statement is John Wood Group PLC,  a company
  registered in Scotland and incorporated under the laws of the United Kingdom
  (referred to herein as the "Reporting Person").  The address of its principal
  business and its principal office is John Wood House, Greenwell Road, East
  Tullos, Aberdeen, Scotland ABI 4AX.

       The Reporting Person is, directly and through its subsidiaries, engaged
  in the international oil services industry.

       The names, business addresses, and present principal employment of the
  directors and executive officers of the Reporting Person and the principal
  business office of the organization in which such employment is conducted are
  described in Schedule I which is attached hereto and incorporated herein by
  reference.

       Neither the Reporting Person nor, to the best of its knowledge, any
  controlling person or person named herein has, during the last five years,
  been convicted in a criminal proceeding (excluding traffic violations and
  similar misdemeanors) .

       Neither the Reporting Person nor to the best of its knowledge any
  controlling person or person named herein has, during the last five years,
  been a party to a civil proceeding of a judicial or administrative body of
  competent jurisdiction and as a result of such proceeding was or is, subject
  to a judgment, decree or final order enjoining future violations of, or
  prohibiting or mandating activities subject to, federal or state securities
  laws or finding any violation with respect to such laws."


  Item 3.  Source and Amount of Funds or Other Consideration.

  Item 3 is hereby amended and restated in its entirety by the following
  paragraphs:

       "The $4,904,014.50 used to make purchases of the Common Stock as
  previously reported pursuant to Schedule 13D and the $633,750.00 used to make
  the purchase reported by this Amendment No. 6 to Schedule 13D came from the
  Reporting Person's working capital."

                              Page 3 of 18 Pages
<PAGE>
 
  Item 4.   Purposes of the Transaction.

  Item 4 is hereby amended and restated in its entirety by the following
  paragraphs:

       "GENERAL.  The Reporting Person originally acquired 6,538,686 shares of
  Common Stock in 1992 in order to obtain a significant equity interest in the
  Company.  On March 5, 1996, the Reporting Person acquired an additional
  780,000 shares of Common Stock as further described herein.  As a result of
  these acquisitions, the Reporting Person owns approximately 52.8% of the
  outstanding capital stock of the Company.

       It is presently contemplated that the Reporting Person may, depending on
  its evaluation of the Company's business, prospects and financial condition,
  the market for  the Common Stock, other opportunities available to the
  Reporting Person, general economic conditions, regulatory conditions,
  financial and stock market conditions and other future developments, make
  additional purchases of Common Stock either in the open market or in private
  transactions (or combinations thereof).  The Reporting Person is continuing to
  evaluate its investment in the Company, including the feasibility of acquiring
  all of the capital stock of the Company.  Any such acquisition would
  necessarily involve extraordinary corporate actions with respect to the
  Company which may involve certain of the actions or occurrences set forth in
  paragraphs (a) through (j) of Item 4 of Schedule 13D, including, without
  limitation, actions to eliminate minority interests in the Company, terminate
  registration status pursuant to Section 12(g)(4) of the 1934 Act and delist
  the Common Stock from the Nasdaq Stock Market.  Depending upon the
  circumstances, the Reporting Person might also hold its shares of Common Stock
  for an extended period of time, or may decide to sell all or part of its
  investment in the Common Stock.  Any such disposition, however, would be
  subject to a potential restriction on transfer of shares of Common Stock as
  described below.  While the Reporting Person is continuing to evaluate its
  investment in the Company, no detailed plans or arrangements have been made at
  this time.

       ORIGINAL PURCHASE AGREEMENT.  The Company filed preliminary proxy
  material in 1992 with the Securities and Exchange Commission concerning the
  Company's Annual Meeting of Stockholders.  At this Annual Meeting, which
  occurred in April 1993, the Company's stockholders were asked to consider and
  vote upon, among other things, a proposed merger (the "Merger") of Old ERC
  with and into its wholly-owned Delaware subsidiary, ERC Subsidiary, Inc.  The
  merger proposal was put forth principally for tax reasons, i.e., with the
  intention of preserving and maximizing the Company's ability (and ERC
  Subsidiary, Inc.'s ability after the Merger) to offset taxable income with the
  Company's net operating loss carry forward.  See "Merger Approval" below.

       The Merger was proposed in order to satisfy a condition precedent to the
  Reporting Person's purchase of 6,538,686 shares of Common Stock pursuant to a
  Stock Purchase Agreement dated October 15, 1992 (the "Purchase Agreement")
  entered into among the Company, the Reporting Person (as purchaser), the
  Company's then-largest stockholder, Quantum Fund, N.V. ("Quantum"), and Warren
  H. Haber, Lawrence N. Pohly and John L. Teager (who, along with Quantum, are
  collectively referred to herein as the "Sellers").  See Items 5 and 6 below.
  The Purchase Agreement provided, as a condition to its consummation, that the
  Certificate of Incorporation of ERC Subsidiary, Inc., the surviving
  corporation in the Merger, contain certain stock transfer restrictions to
  preserve the Company's net operating loss carry forward tax benefits.

       CHARTER PROVISIONS.  Except for the restrictions on transfer of shares of
  Common Stock to be imposed by the Certificate of Incorporation and Bylaws of
  ERC Subsidiary, Inc., the provisions

                              Page 4 of 18 Pages
<PAGE>
 
  of the New ERC charter documents were substantially the same as the charter
  documents of Old ERC.  Although the restrictions on transfer of shares were
  not sought to be imposed as an anti-takeover device, the effect of including
  these provisions may be to impede the acquisition of control of the Company,
  by requiring any person considering an unsolicited tender offer or takeover
  proposal to first negotiate with the Board of Directors.  In addition, the
  Certificate of Incorporation and Bylaws of the Company contained a number of
  provisions which may have had the effect of impeding the acquisition of
  control of the Company by any person.  Set forth below are the other principal
  differences between the Old ERC charter documents and the New ERC charter
  documents.

  (A)  Preferred Stock

            The Old ERC Certificate of Incorporation authorized the issuance of
  875,000 shares of Convertible Preferred Stock, par value $1.00 per share, and
  set forth the powers, rights, preferences, and limitations of the Convertible
  Preferred Stock.  No shares of the Convertible Preferred Stock were issued by
  Old ERC.  The New ERC Certificate of Incorporation authorizes the issuance of
  10,000,000 shares of serial preferred stock, par value $1.00 per share and
  30,000,000 shares of common stock $0.01 par value.

       In addition, the New ERC Bylaws empower an executive committee, if one is
  designated by the Board of Directors, to fix the number of shares or authorize
  the increase or decrease of the shares of any series of stock of New ERC, if
  authorized by Board resolution.

   (B) Stockholder Action by Written Consent

       The Old ERC Certificate of Incorporation prohibited action by
  stockholders by written consent in lieu of a meeting; however, holders of
  shares of Convertible Preferred Stock, serial preferred stock or other class
  of preferred stock could act by written consent to exercise the special voting
  rights, if any, of such shares or series to elect directors as provided in the
  Company Certificate of Incorporation or in a resolution adopted by the Board
  of Directors providing for the issuance of such shares.

       The New ERC Certificate of Incorporation and Bylaws do not contain any
  prohibitions of actions by stockholders by written consent in lieu of a
  meeting.  The New ERC Bylaws contain enabling provisions concerning such
  written consent procedures.

       Thus, under Delaware law, stockholders of New ERC, unlike the
  stockholders of the Company, may take any action required or permitted at an
  annual or special meeting of stockholders without a meeting, without prior
  notice and without a vote, if a consent (or consents) in writing, setting
  forth the action so taken, is signed by holders of outstanding stock having
  not less than the minimum number of votes that would be necessary to authorize
  or take such action at a meeting at which all shares entitled to vote thereon
  were present and voted.  In this respect, the Reporting Person could authorize
  certain transactions or structural changes affecting New ERC, including a
  removal of its directors, without the necessity of calling and holding a
  meeting of New ERC stockholders for such purpose.  See "Purchase of Quantum
  Shares" below.

  (C)  Stockholder Proposals

      Stockholder proposals brought before meetings of stockholders, in addition
  to satisfying certain other conditions, must also be a proper subject for
  actions by security holders under the New ERC Certificate of Incorporation.
  This additional condition was not contained in the Old ERC Certificate of
  Incorporation.

                              Page 5 of 18 Pages
<PAGE>
 
  (D) Removal of Directors

      The Old ERC Certificate of Incorporation provided that, "Subject to the
  rights of holders of any class or series of preferred stock, a director may be
  removed, with or without cause, only by (i) the affirmative vote of the
  holders of at least a majority in voting power of the shares entitled to vote
  in the election of directors or (ii) the affirmative vote of majority of the
  Board of Directors constituting at least a majority of the entire board, but
  only if a majority of the directors acting favorably upon such matter are
  "Continuing Directors" (as defined therein).

      The New ERC Certificate of Incorporation provides that, subject to the
  rights of any series of Serial Preferred Stock or other class of preferred
  stock, a director may be removed, only by: (i) the affirmative vote, with or
  without cause, of the holders of at least a majority in voting power of the
  shares entitled to vote in the election of directors or (ii) the affirmative
  vote, but only for cause, of members of the Board of Directors constituting at
  least a majority of the entire board, but only if a majority of the directors
  acting favorably upon such matter are Continuing Directors.

      (E)   Amendments

      The provisions contained in the Old ERC Certificate of Incorporation
  relating to business combinations could not be amended without the affirmative
  vote of the holders of two-thirds of the shares entitled to vote in the
  election of directors; provided, however, that such amendment could be
  affected by a vote of the holders of a majority of the shares entitled to vote
  in the election of directors if such amendment is declared advisable by the
  Board of Directors by the affirmative vote of the majority of the Board of
  Directors, but only if a majority of the Board members acting favorably upon
  such matters are Continuing Directors.  The New ERC Certificate of
  Incorporation provides that any amendment to its business combination
  provisions shall require the affirmative vote of the holders of at least two-
  thirds of the shares entitled to vote in the election of directors. There is
  no provision for any Board of Directors determination to lower such required
  vote to a majority of the voting shares.

      CONSUMMATION OF THE ORIGINAL PURCHASE.  The Company issued a press release
  on December 2, 1992, announcing that it had rejected an unsolicited offer from
  a third party to acquire all outstanding shares of the Company's common stock
  for $0.77 per share.  In addition, the Reporting Person understands that the
  announcement indicated that the Company's board of directors, in rejecting the
  unsolicited offer, determined that the Company was not for sale at the time
  and that after considering all relevant information, the offer was inadequate.

      On December 4, 1992, the Reporting Person acquired 6,503,686 shares of
  common stock from the Sellers in accordance with the terms of the Purchase
  Agreement.  The Reporting Person purchased 6,303,686 shares from Quantum,
  100,000 shares from Mr. Haber, and 100,000 shares from Mr. Pohly and a charity
  of Mr. Pohly's.  In addition, the Reporting Person had the right under the
  Purchase Agreement to acquire 35,000 shares from Mr. Teager, which purchase
  closed on December 18, 1992.  The total 6,538,686 shares purchased by the
  Reporting Person and which the Reporting Person had the right to acquire at
  the time represented approximately 47.2% of the outstanding shares of Common
  Stock.

      In addition, (i) the Reporting Person agreed that it would use its best
  efforts to cause the Company to, and the Company agreed that it would, cause a
  meeting of its stockholders to be called and held for the purposes of voting
  on the merger (the "Merger") of Old ERC with and into its wholly-owned
  subsidiary, ERC Subsidiary, Inc. on substantially the terms and conditions set
  forth in the Old ERC preliminary proxy material filed in October 1992 with the
  Securities and Exchange

                              Page 6 of 18 Pages
<PAGE>
 
  Commission, and (ii) the Reporting Person agreed that it would vote its shares
  of common stock in the same ratio as a majority of the minority shareholders
  voting on the Merger.  Additionally, the Reporting Person agreed to provide
  the Company the information respecting the Reporting Person's nominees for
  appointment to the board of directors of the Company required by Section 14(f)
  of, and Rule 14f-1 under, the Securities Exchange Act of 1934.

      The Company, the Reporting Person and Steven J. Gilbert, Gary S.
  Gladstein, Warren H. Haber, Gerard E. Manolovici, and Richard H. Rau (the
  "Indemnitees") further agreed that for a period of five years from December 4,
  1992, the Reporting Person would use its best efforts to, and the Company
  would, maintain in effect one or more directors' and officers' liability
  policies providing coverage for each of the Indemnitees with respect to acts
  or omissions occurring on or prior to their dates of resignation on no less
  favorable terms than the insurance coverage currently maintained by the
  Company; provided that such coverage was available at commercially reasonable
  rates, but in any event, such coverage would be provided in an amount not less
  than that which was obtainable for the premium amounts which the Company then
  pays.  In addition, for the same period, the Reporting Person agreed that it
  would use its best efforts to cause the Company to, and the Company agreed to,
  not amend, alter, modify or change the provisions of the Company's Certificate
  of Incorporation and Bylaws relating to indemnification of directors and
  officers as in effect on December 4, 1992, unless such amendment provided
  broader indemnification rights to its then-current and former officers and
  directors than prior law permitted the Company to provide.

      Additionally, the Purchase Agreement contemplated that the Sellers would
  use their best efforts to cause the resignations of four current directors of
  the Company and cause the board of directors of the Company to select four
  designees of the Reporting Person to fill the vacancies caused by such
  resignations.  Effective as of January 8, 1993, Steven J. Gilbert, Gary S.
  Gladstein, Gerard E. Manolovici and Warren H. Haber resigned as directors of
  the Company.  The vacancies created by their resignations were filled on that
  date by the Board of Directors of the Company electing and appointing J. Derek
  P. Jones, Allister G. Langlands, Edwin C. Garrett and C. Nicholas Brown,
  designees of the Reporting Person, as directors of the Company to serve their
  unexpired terms.  Mr. Langlands became a Class 3 director of the Company to
  serve the remainder of Mr. Haber's term as director which expires at the next
  annual meeting of stockholders of the Company.  Mr. Brown became a Class 1
  director to serve the remainder of Mr. Gilbert's term. Mr. Jones became a
  Class 2 director to serve the remainder of Mr. Gladstein's term.  Mr. Garrett
  also became a Class 2 director to serve the remainder of Mr. Manolovici's
  term.  Quantum had agreed in the Purchase Agreement to use its best efforts to
  cause the election of Messrs. Jones, Langlands, Garrett and Brown to fill the
  vacancies caused by the resignations of Messrs. Gilbert, Gladstein, Manolovici
  and Haber.

      MERGER APPROVAL.  On April 16, 1993, the stockholders of Old ERC, approved
  the merger (the "Merger") of the Company with and into New ERC, its wholly-
  owned subsidiary.  Pursuant to the Merger, each share of common stock, par
  value $0.01 per share, of Old ERC was converted into one share of Common Stock
  of New ERC.  As a result of the filing of the Certificate of Ownership and
  Merger in Delaware, New ERC changed its name to ERC Industries, Inc.

      As a result of the Merger, the Certificate of Incorporation of the Company
  now contains certain stock transfer restrictions in order to seek to preserve
  the Company's net operating losses available for carryforward (the "NOL
  Carryforwards").  The Certificate of Incorporation of the Company provides
  that no person who, as a result of any attempted transfer of Common Stock of
  the Company having a fair market value equal to 5% or more of the aggregate
  fair market value of the outstanding shares of the Company's Common Stock, may
  acquire shares of the Company's Common Stock (or options, warrants and rights
  or securities exercisable, convertible or

                              Page 7 of 18 Pages
<PAGE>
 
  exchangeable therefor), unless such person obtains the approval of the Board
  of Directors of the Company.  Any attempted transfer with Board approval (or
  approval of a duly appointed committee of the Board) will be void and without
  effect, and the intended transferee will be deemed to have appointed the
  Company as exclusive agent to sell such shares to a transferee eligible to
  acquire such shares or otherwise approved by the Board of Directors of the
  Company (or a committee thereof). All proceeds from the sale of such shares
  shall be remitted to such appointed transferee.  The restriction on transfer
  will terminate upon the earliest to occur of (i) December 31, 2002, (ii) the
  date when the existing NOL Carryforwards expire or (iii) the date when the NOL
  Carryforwards become subject to the limitations of Section 382 of the Code.

      In addition to receiving the requisite vote required under Delaware law,
  the Merger was also approved by holders of a majority of the shares of Common
  Stock voting for or against the Merger (and not abstaining), not counting any
  votes attributable to shares held or controlled by the Reporting Person,
  Quantum Fund, N.V., and Warren H. Haber, a former director of the Company.

      Effective as of June 11, 1993, C. Nicholas Brown and Edwin C. Garrett
  resigned as directors of New ERC.  The vacancies created by their resignations
  were filled effective as of that date by the Board of Directors of New ERC
  electing and appointing George W. Tilley and Raymond A. Johnson as directors
  to serve their unexpired terms.  Mr. Tilley became a Class 1 director to serve
  the remainder of Mr. Brown's term.  Mr. Tilley's current principal occupation
  is President and Chief Executive Officer of Grant Geophysical Company in
  Houston, Texas, a geophysical seismic and services company.  Formerly, Mr.
  Tilley had been President and Chief Executive Officer of Halliburton
  Geophysical Services, a provider of geophysical products and services to the
  oil and gas industry. Mr. Johnson became a Class 2 director to serve the
  remainder of Mr. Garrett's term. Mr. Johnson was President of Electric
  Submersible Pumps, Inc., a manufacturer of electric submersible pumps and
  related products headquartered in Midland, Texas; Electric Submersible Pumps,
  Inc. is a company affiliated with the Reporting Person. The term of office of
  the Class 1 directors expired at New ERC's next annual meeting of
  stockholders; the term of the Class 2 directors expires at the next succeeding
  annual meeting; and the terms of the Class 3 directors expires at the next
  succeeding annual meeting after the election of the Class 2 directors.  In
  June 1995, Mr. Rau resigned his position as President and as a director of the
  Company; and Wendell Brooks was appointed President of the Company and as a
  director to fill Mr. Rau's unexpired term. Mr. Johnson resigned as a director
  in January 1996, and Anthony Howells has been appointed to fill his unexpired
  term.  Mr. Howells is currently a management consultant to oil and gas service
  companies and from 1966 to 1991 was employed by Dresser Atlas in various
  management positions.

      The current directors of the Company are J. Derek P. Jones, Allister G.
  Langlands, George W. Tilley, Wendell Brooks and Anthony Howells.  By virtue of
  four of the directors of New ERC being designees of the Reporting Person,
  these designees control all decisions made by the Board of Directors,
  including decisions to sell additional securities, enter into financial
  arrangements, fill vacancies on the Board of Directors, amend certain of the
  Bylaws of New ERC, and approve certain transactions, both with the Reporting
  Person and its affiliates and with third parties.  Messrs. Jones, Langlands
  and Brooks are also officers and/or employees of the Reporting Person (and
  certain of its subsidiaries or its affiliates), and there can be no assurance
  that conflicts of interest will not arise.

      PURCHASE OF QUANTUM SHARES.  On March 5, 1996, the Reporting Person and
  Quantum entered into a Letter Agreement (the "Letter Agreement"), a copy of
  which is attached as Exhibit H hereto, whereby Quantum agreed to sell and the
  Reporting Person agreed to purchase an aggregate of an additional 780,000
  shares of Common Stock in a privately-negotiated transaction.  Pursuant to the
  Letter Agreement, the purchase price for such shares of Common Stock was
  $0.8125 (13/16) per share (or an aggregate consideration of $633,750).
  Pursuant to the Company's Certificate of

                              Page 8 of 18 Pages
<PAGE>
 
  Incorporation, the purchase was approved by the board of directors of the
  Company prior to the execution of the Letter Agreement.  The transaction was
  conducted entirely between the Reporting Person and Quantum, and, except for
  the Letter Agreement, there was no agreement or other documentation prepared
  in connection with the transaction.  As a result of this sale, the Reporting
  Person understands that Quantum no longer owns any shares of Common Stock.

      As a  result of the purchase of additional shares from Quantum, the
  Reporting Person currently owns an aggregate of 7,318,686 shares representing
  approximately 52.8% of the outstanding shares of Common Stock of New ERC.
  Consequently, the Reporting Person has the power to elect New ERC's Board of
  Directors and to approve certain actions requiring stockholder approval,
  including a merger or combination of New ERC (with the Reporting Person or
  otherwise), a going private transaction, or a sale of all or substantially all
  of the Company's assets.  See "Charter Provisions" above."

  Item 5.  Interest in Securities of the Issuer.

  Item 5 is hereby amended and restated in its entirety by the following
  paragraphs:

      "(a), (b)   On December 4, 1992, the Reporting Person acquired 6,503,686
  shares of Common Stock from the Sellers in accordance with the terms of the
  Purchase Agreement.  The Reporting Person purchased 6,303,686 shares from
  Quantum, 100,000 shares from Mr. Haber, 100,000 shares from Mr. Pohly and a
  charity of Mr. Pohly's and 35,000 shares from Mr. Teager.  The total 6,538,686
  shares purchased by the Reporting Person pursuant to the Purchase Agreement
  represented approximately 47.2% of the outstanding shares of Common Stock.
  Additionally, as a result of that certain Standstill and Voting Agreement
  dated October 15, 1992 entered into by and among the Reporting Person,
  Quantum, and the Company, (the "Standstill and Voting Agreement"), and an
  irrevocable proxy granted to the Reporting Person by Quantum (See Item 6), the
  Reporting Person had the power to direct the vote of all 7,083,686 shares of
  common stock of the Company owned by Quantum (i) for the Merger (provided that
  holders of a majority of the Public Shares present in person or by proxy at
  the Annual Meeting voted for the Merger proposal) and (ii) for the Reporting
  Person's designees to the Company's Board of Directors (and against their
  removal by Company stockholders other than the Reporting Person).

      On March 5, 1996, the Reporting Person and Quantum entered into the Letter
  Agreement whereby Quantum agreed to sell and the Reporting Person agreed to
  purchase an aggregate of an additional 780,000 shares of Common Stock in a
  privately-negotiated transaction.  Pursuant to the Letter Agreement, the
  purchase price for such shares of Common Stock was $0.8125 (13/16) per share
  (or an aggregate consideration of $633,750).  Pursuant to the Company's
  Certificate of Incorporation, the purchase was approved by the board of
  directors of the Company prior to the execution of the Letter Agreement.  The
  transaction was conducted entirely between the Reporting Person and Quantum,
  and, except for the Letter Agreement, there was no agreement or other
  documentation prepared in connection with the transaction. As a result of the
  purchase, the Reporting Person currently owns an aggregate of 7,318,686 shares
  representing approximately 52.8% of the outstanding shares of Common Stock of
  New ERC.  Consequently, the Reporting Person has the power to elect New ERC's
  Board of Directors and to approve certain actions requiring stockholder
  approval, including a merger or combination of New ERC (with the Reporting
  Person or otherwise), a going private transaction, or a sale of all or
  substantially all of the Company's assets.  Additionally, as a result of this
  purchase, the Standstill and Voting Agreement terminated effective as of March
  5, 1996.

                              Page 9 of 18 Pages
<PAGE>
 
      (c) Except as otherwise described herein, neither the Reporting Person
  nor, to the best of its knowledge, any person whose name is set forth herein
  has engaged in any transactions with respect to shares of Common Stock during
  the past 60 days.

      (d)   Not applicable.

      (e)   Not applicable."


  Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
  to Securities of the Issuer.

  Item 6 is hereby amended and restated in its entirety by the following
  paragraphs:

      "On October 15, 1992, the Sellers, along with the Company, entered into
  the Purchase Agreement with the Reporting Person whereby the Sellers agreed to
  sell, and the Reporting Person agreed to purchase, subject to the terms and
  conditions of the Purchase Agreement, an aggregate of 6,538,686 shares of the
  Common Stock of the Company (which amount represented approximately 47.16% of
  the outstanding shares of common stock of the Company as of October 15, 1992)
  for a purchase price of $.75 per share, or $4,904,014.50 in the aggregate.
  Under the Purchase Agreement, Quantum agreed to sell to the Reporting Person
  6,303,686 shares of Common Stock, and Messrs. Haber, Pohly and Teager agreed
  to sell 100,000, 100,000, and 35,000 shares, respectively.

      Pursuant to the Standstill and Voting Agreement, Quantum agreed for a
  period commencing on the date of the Standstill and Voting Agreement and
  continuing for three years plus ninety days following the consummation of the
  transactions described in the Purchase Agreement, not to effect any
  transaction with respect to any of the shares of Common Stock retained by it
  or any interest therein, without the prior written consent of the Board of
  Directors of the Company, if the transaction may result in the Company being
  subject to the limitations on the use of the Company's net operating losses
  pursuant to Section 382 of the Internal Revenue Code of 1986 (the "Code").
  These transactions included, but were not limited to (a) any sale, conveyance,
  transfer or entering into any agreement to sell or convey any of such retained
  shares; (b) any grant of any warrants, options, rights, convertible debt
  instruments or other securities which are exercisable for, convertible into or
  exchangeable for any or all of such retained shares, or other similar
  interests or rights in such shares; or (c) any conveyance, transfer or other
  disposition of its retained shares or any interest in its retained shares in
  any transaction or series of transactions which would or may be treated as a
  sale, conveyance, transfer or disposition for purposes of Section 382 of the
  Code or the regulations promulgated thereunder.  See "Item 4 - Consummation of
  the Original Purchase" above.

      Quantum also agreed that, for a period of four years following
  consummation of the transactions described in the Purchase Agreement or until
  such earlier date that Quantum ceases to be the beneficial owner of voting
  stock of the Company, it would vote its shares of Common Stock for the
  Reporting Person designees for election or appointment to the Board of
  Directors.

      The Standstill and Voting Agreement terminated as of March 5, 1996.

      On December 4, 1992, the Reporting Person acquired 6,503,686 shares of
  Common Stock from the Sellers in accordance with the terms of the Purchase
  Agreement.  The total 6,538,686 shares purchased by the Reporting Person and
  which the Reporting Person had the right to acquire at the time represented
  approximately 47.2% of the outstanding shares of Common Stock.  See "Item 4 -
  Consummation of the Original Purchase" and "Merger Approval" above.

                              Page 10 of 18 Pages
<PAGE>
 
      The Company, the Reporting Person and Steven J. Gilbert, Gary S.
  Gladstein, Warren H. Haber, Gerard E. Manolovici, and Richard H. Rau (the
  "Indemnitees") further agreed that for a period of five years from December 4,
  1992, the Reporting Person would use its best efforts to, and the Company
  would, maintain in effect one or more directors' and officers' liability
  policies providing coverage for each of the Indemnitees with respect to acts
  or omissions occurring on or prior to their dates of resignation on no less
  favorable terms than the insurance coverage maintained by the Company;
  provided that such coverage was available at commercially reasonable rates,
  but in any event, such coverage was provided in an amount not less than that
  which was obtainable for the premium amounts which the Company paid. In
  addition, for the same period, the Reporting Person agreed that it would use
  its best efforts to cause the Company to, and the Company agreed to, not
  amend, alter, modify or change the provisions of the Company's Certificate of
  Incorporation and Bylaws relating to indemnification of directors and officers
  as in effect on December 4, 1992, unless such amendment provided broader
  indemnification rights to its then-current and former officers and directors
  than prior law permitted the Company to provide.

      Additionally, the Purchase Agreement contemplated that the Sellers would
  use their best efforts to cause the resignations of four current directors of
  the Company and cause the board of directors of the Company to select four
  designees of the Reporting Person to fill the vacancies caused by such
  resignations.  See "Item 4 - Consummation of the Original Purchase" above.

      J. Derek P. Jones, a director of the Reporting Person (who was elected as
  a director of the Company in order to fill the vacancy created by the
  resignation of Gary S. Gladstein effective as of January 8, 1993), was also
  appointed as a proxy to vote the shares held by Quantum under the terms of the
  irrevocable proxy dated October 15, 1992 granted by Quantum to the Reporting
  Person.

      As a result of the Merger, the Certificate of Incorporation of the Company
  contains certain stock transfer restrictions in order to seek to preserve the
  Company's net operating losses available for carryforward (the "NOL
  Carryforwards").  The Certificate of Incorporation of the Company provides
  that no person who, as a result of any attempted transfer of Common Stock of
  the Company having a fair market value equal to 5% or more of the aggregate
  fair market value of the outstanding shares of the Company's Common Stock, may
  acquire shares of the Company's Common Stock (or options, warrants and rights
  or securities exercisable, convertible or exchangeable therefor), unless such
  person obtains the approval of the Board of Directors of the Company.  Any
  attempted transfer with Board approval (or approval of a duly appointed
  committee of the Board) will be void and without effect, and the intended
  transferee will be deemed to have appointed the Company as exclusive agent to
  sell such shares to a transferee eligible to acquire such shares or otherwise
  approved by the Board of Directors of New ERC (or a committee thereof).  All
  proceeds from the sale of such shares shall be remitted to such appointed
  transferee.  The restriction on transfer will terminate upon the earliest to
  occur of (i) December 31, 2002, (ii) the date when the existing NOL
  Carryforwards expire or (iii) the date when the NOL Carryforwards become
  subject to the limitations of Section 382 of the Code.


      On March 5, 1996, the Reporting Person and Quantum entered into the Letter
  Agreement whereby Quantum agreed to sell and the Reporting Person agreed to
  purchase an aggregate of 780,000 additional shares of Common Stock (which
  represented approximately 5.6% of the Common Stock as of December 31, 1995) in
  a privately-negotiated transaction.  Pursuant to the Letter Agreement, the
  purchase price for such shares of Common Stock was $0.8125 (13/16) per share
  (or an aggregate consideration of $633,760). The transaction was conducted
  entirely between the Reporting Person and Quantum, and, except for the Letter
  Agreement, there was no agreement

                              Page 11 of 18 Pages
<PAGE>
 
  or other documentation prepared in connection with the transaction.  The
  transaction was approved by the Company's board of directors prior to the
  execution of the Letter Agreement.

      As a result of the purchase of additional shares from Quantum, the
  Reporting Person currently owns an aggregate of 7,318,686 shares representing
  approximately 52.8% of the outstanding shares of Common Stock of New ERC.
  Consequently, the Reporting Person has the power to elect New ERC's Board of
  Directors and to approve certain actions requiring stockholder approval,
  including a merger or combination of New ERC (with the Reporting Person or
  otherwise), a going private transaction, or a sale of all or substantially all
  of the Company's assets."


  Item 7.  Material to be Filed as Exhibits.

  Item 7 is hereby amended and restated in its entirety by the following
  paragraphs:

  *A  Form of proposed Certificate of Ownership and Merger merging ERC
      Industries, Inc. into ERC Subsidiary, Inc.

  *B  Stock Purchase Agreement dated October 15, 1992 among the John Wood Group
      PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber, Lawrence M. Pohly
      and John L. Teager, as Sellers, and ERC Industries, Inc.

  *C  Standstill and Voting Agreement dated October 15, 1992 among John Wood
      Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

  *D  Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group PLC
      and J. Derek P. Jones.

  *E  Notice of Waiver of Conditions to Consummate Purchase Agreement dated
      November 30, 1992.

  *F  Agreement dated December 4, 1992, between the Reporting Person and ERC
      Industries, Inc.

  *G  Agreement dated December 4, 1992, among the Reporting Person, ERC
      Industries, Inc., and the Indemnitees.

 **H  Letter Agreement dated March 5, 1996, between the Reporting Person
      and Quantum.
  __________________
      *     Previously filed.
      **    Filed herewith.

                              Page 12 of 18 Pages
<PAGE>
 
                                   SIGNATURE



      After reasonable inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this Amendment No. 6 to Schedule 13D
  is true, complete and correct.


      Date: March 5, 1996.


                                 JOHN WOOD GROUP PLC



                                 By:   /s/ J. DEREK P. JONES
                                      ---------------------------
                                      Name:  J. Derek P. Jones
                                      Title: Director





                              Page 13 of 18 Pages
<PAGE>
 
                                 EXHIBIT INDEX


  *A   Form of proposed Certificate of Ownership and Merger merging ERC
       Industries, Inc. into ERC Subsidiary, Inc.

  *B   Stock Purchase Agreement dated October 15, 1992 among the John Wood Group
       PLC, as Purchaser, Quantum Fund, N.V., Warren H. Haber, Lawrence M. Pohly
       and John L. Teager, as Sellers, and ERC Industries, Inc.

  *C   Standstill and Voting Agreement dated October 15, 1992 among John Wood
       Group PLC, Quantum Fund, N.V. and ERC Industries, Inc.

  *D   Irrevocable Proxy executed by Quantum Fund, N.V. to John Wood Group PLC
       and J. Derek P. Jones.

  *E   Notice of Waiver of Conditions to Consummate Purchase Agreement dated
       November 30, 1992.

  *F   Agreement dated December 4, 1992, between the Reporting Person and ERC
       Industries, Inc.

  *G   Agreement dated December 4, 1992, among the Reporting Person, ERC
       Industries, Inc., and the Indemnitees.

 **H   Letter Agreement dated March 5, 1996, between the Reporting Person
       and Quantum.
  __________________
       * Previously filed.
      ** Filed herewith.

                              Page 14 of 18 Pages
<PAGE>
 
                                                                      SCHEDULE I
                                                                          PAGE 1

                        EXECUTIVE OFFICERS AND DIRECTORS
                                       OF
                              JOHN WOOD GROUP PLC


NAME AND CAPACITY WITH
JOHN WOOD GROUP PLC

Ian C. Wood C.B.E., LL.D.
Chairman and Managing Director



Edward C. Garrett
Vice Chairman and Director



William H. Carr
Director



William Edgar
Director



Allister G. Langlands
Director and Group Financial
   Director



BUSINESS ADDRESS

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX


John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
AB1 4AX

                              Page 15 of 18 Pages
<PAGE>
 
                                                                      SCHEDULE I
                                                                          PAGE 2

                        EXECUTIVE OFFICERS AND DIRECTORS
                                       OF
                              JOHN WOOD GROUP PLC


NAME AND CAPACITY WITH
JOHN WOOD GROUP PLC

Tom Motherwell
Director



J. Derek Prichard-Jones
Director


J. Ramsay Spence O.B.E.
Director



Ewan Brown
Director



C. Nicholas Brown
Group Company Secretary


BUSINESS ADDRESS

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood Group USA, Inc.
16920 Park Row
Houston, Texas 77084

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

John Wood House
Greenwell Road
East Tullos
Aberdeen, Scotland
ABI 4AX

                              Page 16 of 18 Pages
<PAGE>
 
                                                                      SCHEDULE I
                                                                          PAGE 3


  Ian C. Wood C.B.E., LL.P.

  Mr. Wood's principal occupation is Chairman and Managing Director of John Wood
  Group PLC. Mr. Wood is also chairman and Managing Director of J.W. Holdings
  Ltd.


  Edwin C. Garrett.

  Mr. Garrett's principal occupation is Vice Chairman of John Wood Group PLC and
  Managing Director of J.W. Holdings Ltd.


  William H. Carr.

  Mr. Carr's principal occupation is serving as Managing Director of Wood
  Group's Fire and Safety activities.


  William Edgar.

  Mr.  Edgar's principal occupation is serving as Managing Director of Wood
  Group's Engineering and Logistics activities.


  Allister G. Langlands.

  Mr. Langlands' principal occupation is Group Financial Director of John Wood
  Group PLC.


  Tom Motherwell.

  Mr. Motherwell's principal occupation is serving as Managing Director of Wood
  Group's Gas Turbine activities.

                              Page 17 of 18 Pages
<PAGE>
 
                                                                      SCHEDULE I
                                                                          PAGE 4

  J. Derek Prichard-Jones.

  Mr.  Jones' principal occupation is serving as director of John Wood Group PLC
  and as President of Wood Group USA, Inc., an indirect wholly-owned subsidiary
  of John Wood Group PLC located in Houston, Texas performing administrative
  services for John Wood Group PLC's U.S. operations. Mr. Jones also serves in
  various other capacities for other subsidiaries and affiliates of John Wood
  Group PLC, and in his capacity as Managing Director of the Group's Drilling
  and Production Services Division.


  J. Ramsay Spence O.B.E.

  Mr.  Spence's principal occupation is serving as Group Director responsible
  for Safety, Environment and Quality.


  Ewan Brown.

  Mr. Brown's principal occupation is serving as Director of Noble Grossart
  Ltd., a merchant bank operating in Edinburgh.


  C. Nicholas Brown.

  Mr. Brown's principal occupation is Group Company Secretary of John Wood Group
  PLC, and serving as secretary of John Wood Group PLC's United Kingdom-based
  subsidiary companies, having principal responsibility for the group's legal,
  contractual and company secretarial matters.

                              Page 18 of 18 Pages

<PAGE>
 
                                                                       EXHIBIT H

                            QUANTUM GROUP OF FUNDS


BY COURIER

March 5, 1996

Arthur Nathan, Esq.
Haynes & Boone
1000 Louisiana
Suite 4300
Houston, TX 77002-5012

RE:  SALE OF 780,000 SHARES OF ERC INDUSTRIES, INC.

Dear Arthur:

This is to confirm our understanding that your client, John Wood Group PLC, has 
agreed to purchase from Quantum Fund N.V. ("Quantum") 780,000 shares of ERC 
Industries, Inc. ("ERC") at a purchase price per share of $13/16, for a total 
consideration of $633,750.00. This amount should be transferred by wire by 
Tuesday, March 5, 1996 pursuant to the following account information:

                   The Bank of New York
                   ABA #: 021-000018
                   Account #: 8540-90-5100
                   Account Name: Arnhold and S. Bleichroeder
                   F/A/O: Quantum Partners LDC
                   Attention: Robert Miller

Please find enclosed a copy of a set of resolutions adopted by Quantum in which 
it is resolved to sell 780,000 shares of ERC to John Wood Group PLC pursuant to 
the terms described above and to deliver stock certificates representing a total
of 780,000 shares, as well as a copy of a power of attorney authorizing me, as 
well as certain other employees of Soros Fund Management to act on behalf of 
Quantum in connection with this transaction.

Also enclosed are stock certificates representing ownership of 295,170 and
42,102 shares of ERC by Quantum and Quantum Overseas N.V., respectively. Quantum
Overseas N.V. was a subsidiary of Quantum and has since been liquidated, Quantum
being its successor. Also enclosed are two stock powers authorizing the transfer
of an aggregate of 780,000 shares of ERC to John Wood Group PLC. As we
discussed, a certificate representing the balance of the shares currently owned
by Quantum (442,728 shares) is in the process of being produced by DTC and we
expect to have it by the middle of next week. It will be forwarded to you once
we have received it.

                            QUANTUM GROUP OF FUNDS
         KAYA FLAMBOYAN 9 . WILLEMSTAD, CURACAO . NETHERLANDS ANTILLES
        TELEPHONE: 5999 322422 . TELEX: 3445 CITCO NA . FAX 5999 322420

<PAGE>
 
Page 2

Kindly confirm that this letter accurately reflects our entire understanding by 
signing and returning a counterpart of this letter.

                                           QUANTUM FUND N.V.

                   
                                           By: /s/ Michael C. Neus
                                              ------------------------
                                              Name:  Michael C. Neus
                                              Title: Attorney-in-Fact

Acknowledged and confirmed on behalf
of John Wood Group PLC

By: /s/ Arthur Nathan
   -----------------------------------
   Name:  Arthur Nathan
   Title: Attorney


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