Document:

Amendment to Amended and Restated Rights Agreement

 Exhibit 4.1 
 AMENDMENT TO 
 AMENDED AND RESTATED RIGHTS AGREEMENT 
 Amendment, dated as of June 1, 2009 (this “Amendment”), to the Amended and Restated Rights Agreement, dated as of May 14, 2008 (the
“Rights Agreement”), between NATCO Group Inc., a Delaware corporation (the “Company”), and Mellon Investor Services LLC, a New Jersey limited liability company, as Rights Agent (as successor to ChaseMellon Shareholder Services,
L.L.C.) (the “Rights Agent”). 
 RECITALS 
 WHEREAS, the Company and the Rights Agent have heretofore executed and entered into the Rights Agreement. 
 WHEREAS, Cameron International Corporation, a Delaware corporation (“Cameron”) and the Company contemplate entering into an Agreement and Plan of Merger (the “Merger Agreement”) pursuant to which a wholly
owned subsidiary of Cameron will merge with and into the Company (the “Merger”). The Board of Directors of the Company has unanimously approved the Merger Agreement and the Merger. 
 WHEREAS, pursuant to Section 29 of the Rights Agreement, the Company and the Rights Agent may from time to time supplement or amend the
Rights Agreement subject to the terms of the Rights Agreement. 
 WHEREAS, the Board of Directors of the Company has determined that
an amendment to the Rights Agreement as set forth herein is necessary and desirable in connection with the foregoing and the Company desires to evidence such amendment in writing. 
 WHEREAS, all acts and things necessary to make this Amendment a valid agreement, enforceable according to its terms have been done and performed,
and the execution and delivery of this Amendment by the Company have been in all respects duly authorized by the Company. 
 AGREEMENT 

 Accordingly, the parties agree as follows: 
 A. Addition of Certain Definitions. Section 1.(a) of the Rights Agreement is supplemented to add the following definitions in the appropriate locations: 
 “Cameron” means Cameron International Corporation, a Delaware corporation. 
 “Cameron Merger Agreement” shall mean the Agreement and Plan of Merger, dated as of June 1, 2009, by and among the Company,
Cameron and the other party thereto, as it may be amended from time to time. 

 “Merger” shall mean the merger of Merger Sub with and into the Company as
contemplated by the Cameron Merger Agreement. 
 B. Amendment of the definition of “Acquiring Person”. The definition of
“Acquiring Person” in Section 1.(a) of the Rights Agreement is amended by adding the following sentence at the end thereof: 
 “Notwithstanding anything in this Agreement to the contrary, neither Cameron nor any of its Affiliates or Associates shall be deemed to be an Acquiring Person as a result of (i) the approval, execution or
delivery of the Cameron Merger Agreement, (ii) the announcement of the Cameron Merger Agreement, or (iii) the consummation of the Merger or any other transaction contemplated by the Cameron Merger Agreement.”
 C. Amendment of the definition of “Final Expiration Date”. The definition of “Final Expiration Date” in Section 1.(a) of
the Rights Agreement is amended and restated in its entirety to read as follows: 
 “Final Expiration Date” shall
mean the earlier of (i) the Close of Business on May 15, 2018 or (ii) the time immediately prior to the Effective Time (as defined in the Cameron Merger Agreement). 
 D. Addition of New Section. The Rights Agreement is amended by adding a new Section 38, which shall read in its entirety as follows:

 “Section 38. Certain Exceptions. Notwithstanding anything in this Agreement to the contrary, no Distribution
Date and no Shares Acquisition Date shall occur or be deemed to occur as a result of (i) the approval, execution or delivery of the Cameron Merger Agreement, (ii) the announcement of the Cameron Merger Agreement, or (iii) the
consummation of the Merger or any other transaction contemplated by the Cameron Merger Agreement.” 
 E. Effectiveness. This
Amendment shall be deemed effective as of the date first written above, as if executed on such date. Except as amended hereby, the Rights Agreement shall remain in full force and effect and shall be otherwise unaffected hereby. The Company shall
give the Rights Agent reasonable advance written notice of the Effective Time; provided however, that if the Company is the surviving corporation under the Cameron Merger Agreement, the Company shall give the Rights Agent prompt written notice of
the Effective Time. 
 F. The undersigned officer of the Company, being duly authorized on behalf of the Company, hereby certifies in his or
her capacity as an officer of the Company to the Rights Agent that this Amendment complies with Section 29 of the Rights Agreement. 
 G. The Rights Agent shall not be subject to, nor be required to interpret or comply with, nor determine if any Person has complied with, the Cameron Merger Agreement, even though reference thereto may be made in this Amendment or the Rights
Agreement. 

 H. Miscellaneous. This Amendment shall be deemed to be a contract made under the laws of the State
of Delaware and for all purposes shall be governed by and construed in accordance with the laws of such State applicable to contracts to be made and performed entirely within such State. This Amendment may be executed in any number of counterparts
and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. If any term, provision, covenant or restriction of this Amendment is held by a
court of competent jurisdiction or other authority to be invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of this Amendment shall remain in full force and effect and shall in no way be affected,
impaired or invalidated. 
 [Signature Page Follows] 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed and attested, all
as of the date and year first above written. 
  

									
	Attest	 		 	NATCO GROUP INC.
					
	By:	 	 /s/ Katherine P. Ellis
	 		 	By:	 	 /s/ John U. Clarke

	Name:	 	 Katherine P. Ellis
	 		 	Name:	 	 John U. Clarke

	Title:	 	 Senior Vice President and Secretary
	 		 	Title:	 	 Chairman and Chief Executive Officer

				
	Attest	 		 		 	 MELLON INVESTOR SERVICES LLC,
 as Rights Agent

					
	By:	 	 /s/ Georg Drake
	 		 	By:	 	 /s/ Peter Sablich

	Name:	 	 Georg Drake
	 		 	Name:	 	 Peter Sablich

	Title:	 	 Relationship Manager
	 		 	Title:	 	 Vice PresidentAmendment to the Directors Compensation Plan

 Exhibit 10.1 
 AMENDMENT TWO TO THE NATCO GROUP INC. 
 DIRECTORS COMPENSATION PLAN 
 WHEREAS, effective as of January 1, 1998, NATCO GROUP INC. (the “Company”) established the NATCO Group Inc. Directors Compensation Plan
(the “Plan”), a compensation and benefits plan with respect to directors who are not employees of the Company, which included provision for cash remuneration, stock and stock-based remuneration; and 
 WHEREAS, the Board of Directors wishes to amend the Plan to make the changes as specified below; and 
 WHEREAS, initially capitalized terms used but not defined in this amendment shall have the meanings ascribed thereto in the Plan. 
 NOW, THEREFORE, the Company hereby adopts Amendment No. 2 to the NATCO Group Inc. Directors Compensation Plan as follows: 

1. Section 6.2 of the Plan is hereby amended, effective as of the date hereof, by adding the following new Subsection (d) to the end thereof,
to be and read as follows: 
 “(d) In the event of changes in the Company’s outstanding Stock by reason of
recapitalizations, reorganizations, mergers, consolidations, combinations, split-ups, split-offs, spin-offs, exchanges or other relevant changes in capitalization or distributions to the holders of Stock occurring after the date of the grant of any
Award, such Award and any agreement evidencing such Award shall be subject to adjustment by the Board as to the number and purchase price of shares of Stock subject to such Award so that such Option shall thereafter cover securities of the acquiring
person as determined by the Board. Any adjustment pursuant to this Section 6.2(d) shall be made in a manner that complies with the requirements of Code Section 409A and the regulatory guidance issued thereunder. Notwithstanding the
preceding, no such adjustments may materially change the value of benefits available to a Participant under a previously granted Award.” 
 IN WITNESS WHEREOF, the Company has caused the Plan to be amended by this Amendment this
1st day of June, 2009. 
  

			
	NATCO GROUP INC.
		
	By:	 	/s/ John U. Clarke
		 	John U. Clarke
		 	Chairman & Chief Executive OfficerForm Amendment to Option Awards Agreement

 Exhibit 10.2 
 AMENDMENT TO OPTION AWARD AGREEMENTS 
 BETWEEN NATCO GROUP, INC. AND THE UNDERSIGNED 
 This Amendment is dated June 1, 2009, between
                     (“Director”) and NATCO Group, Inc. and its affiliated and subsidiary companies (the “Company”).

 WHEREAS, the Director currently has awards of nonqualified stock options under the NATCO Group, Inc. Directors Compensation Plan (the
“Plan”); and 
 WHEREAS, the Director and the Company desire to amend each Nonemployee Director’s Stock Option Agreement
listed on Exhibit A to provide that upon any Corporate Change in which the Company is not the surviving entity the Option will permit the Director to acquire shares of the surviving entity’s common stock; 
 NOW, THEREFORE, in consideration of the premises and other good and valuable consideration, the receipt of which is hereby acknowledged, the Director and
the Company hereby agree to amend each award agreement previously entered into with the Director under the Plan by adding the following new section at the end of the award agreement immediately before the signature provision, if any: 
 “Adjustment Due to Corporate Change. In the event of changes in the Company’s outstanding Stock by reason of
recapitalizations, reorganizations, mergers, consolidations, combinations, split-ups, split-offs, spin-offs, exchanges or other relevant changes in capitalization or distributions to the holders of Stock occurring after the date of the grant of this
Award, this Option shall be subject to adjustment by the Board as to the number and purchase price of shares of Stock subject to this Option so that such Option shall thereafter cover securities of the acquiring person as determined by the Board.
Any adjustment pursuant to this provision shall be made in a manner that complies with the requirements of Code Section 409A and the regulatory guidance issued thereunder. Notwithstanding the preceding, no such adjustments may materially change
the value of benefits available to the Director under this Agreement.” 
 This Amendment may be executed in two or more
counterparts. 
 IN WITNESS WHEREOF, the undersigned have executed this Agreement effective as of the date first written
above. 
  

			
	NATCO GROUP, INC.
		
	By:	 	 
		 	John U. Clarke
		 	Chairman & Chief Executive Officer
	
	DIRECTOR:
	
	 

  

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 EXHIBIT A 
 List of Option Agreements 
 (Attached) 
  

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