AMENDMENT
NO. 9 TO RIGHTS AGREEMENT

    


    Amendment
No. 9, dated as of March 19, 2009 ("Amendment No. 9"), to
the Rights Agreement dated as of March 9, 1999, as amended as of June 9, 1999,
April 7, 2000, October 26, 2000, February 21, 2001, February 28, 2002, September
18, 2002, December 13, 2004 and March 14, 2007 (the "Rights Agreement"),
between Merrimac Industries, Inc., a Delaware corporation (the "Company"), and
American Stock Transfer & Trust Company, LLC, as Rights Agent (the "Rights
Agent").

    


         WHEREAS,
the Company and the Rights Agent entered into the Rights Agreement;
and

    


         WHEREAS,
the Board of Directors of the Company, in accordance with Section 27 of the
Rights Agreement, deems it desirable and in the best interests of the Company
and its stockholders to amend the Rights Agreement as set forth
herein;

    


         NOW,
THEREFORE, in consideration of the premises and mutual agreements herein
set forth, the parties hereby agree as follows:

    


    SECTION
1. CERTAIN DEFINITIONS.

    


             (a)
For purposes of this Amendment No. 9, capitalized terms used herein and not
otherwise defined shall have the meanings indicated in the Rights Agreement.
Each reference to "hereof", "herein" and "hereby" and each other similar
reference and each reference to "this Agreement" and each other similar
reference contained in the Rights Agreement shall refer to the Rights Agreement
as amended hereby.

    


    SECTION
2.  EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF
RIGHTS.

    


    The text of Section 7(b)(i) of the
Rights Agreement is hereby amended and restated in its entirety to read as
follows:

    


    “the close of business of December 31,
2009 (the “Final
Expiration Date”),”.

    


    SECTION
3.  FORM OF RIGHT CERTIFICATE

    


    Exhibit A to the
Rights Agreement (Form of Right Certificate) is hereby amended by replacing each
occurrence of the text “March 19, 2009” therein with the text “December 31,
2009”.

    


    SECTION
4. BENEFITS OF THIS AGREEMENT. Nothing in this Amendment No. 9 shall be
construed to give to any Person other than the Company, the Rights Agent and the
registered holders of the Rights any legal or equitable right, remedy or claim
under this Amendment No. 9, but this Amendment No. 9 shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Rights.

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    


    SECTION
5. SEVERABILITY. If any term, provision or restriction of this Amendment No. 9
is held by a court of competent jurisdiction or other authority to be invalid,
void or unenforceable, the remainder of the terms, provisions and restrictions
of this Amendment No. 9 shall remain in full force and effect and shall in no
way be affected, impaired or invalidated.

    


    SECTION
6. GOVERNING LAW. This Amendment No. 9 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; provided,
however, that all provisions regarding the rights, duties and obligations of the
Rights Agent shall be governed by and construed in accordance with the laws of
the State of New York applicable to contracts made and to be performed entirely
within such State. 

    


    SECTION
7. COUNTERPARTS. This Amendment No. 9 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.

    


    SECTION
8. DESCRIPTIVE HEADINGS. Descriptive headings of the several Sections of this
Amendment No. 9 are inserted for convenience only and shall not control or
affect the meaning or construction of any of the provisions hereof.

    


    SECTION
9. RIGHTS AGREEMENT AS AMENDED. This Amendment No. 9 shall be effective as of
the date hereof and, except as set forth herein, the Rights Agreement shall
remain in full force and effect and be otherwise unaffected hereby.

    


    


    [Signature
page follows]

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    IN
WITNESS WHEREOF, the parties hereto have caused this Amendment No. 9 to be duly
executed and attested, all as of the day and year first above
written.

     

    
      
        
          
            
              
                
                  
                    
                      
                        
                          	 	MERRIMAC INDUSTRIES,
      INC.	 
	 	 	 	 
	
                                   

                                	
                                  By:
      

                                	/s/ Mason N. Carter	 
	 	 	Name:
      Mason N. Carter	 
	 	 	
                                  Title:
      Chairman, President and Chief
      Executive Officer

                                
	 	 	 	 
	 	 	 	 
	 	
                                  AMERICAN
      STOCK TRANSFER &

                                  TRUST
      COMPANY, LLC

                                  as
      Rights Agent

                                	 
	 	 	 	 
	 	By:	/s/
      Herbert J. Lemmer	 
	 	 	Name:  Herbert
      J. Lemmer	 
	 	 	Title:
      Vice President