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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001209191-10-000328.txt : 20100104
<SEC-HEADER>0001209191-10-000328.hdr.sgml : 20100101
<ACCEPTANCE-DATETIME>20100104173142
ACCESSION NUMBER:		0001209191-10-000328
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20091223
FILED AS OF DATE:		20100104
DATE AS OF CHANGE:		20100104

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERRIMAC INDUSTRIES INC
		CENTRAL INDEX KEY:			0000706864
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPONENTS, NEC [3679]
		IRS NUMBER:				221642321
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1230

	BUSINESS ADDRESS:	
		STREET 1:		41 FAIRFIELD PL
		CITY:			W CALDWELL
		STATE:			NJ
		ZIP:			07006-0986
		BUSINESS PHONE:		9735751300

	MAIL ADDRESS:	
		STREET 1:		41 FAIRFIELD PLACE
		CITY:			WEST CALDWELL
		STATE:			NJ
		ZIP:			07007-0986

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CRANE CO /DE/
		CENTRAL INDEX KEY:			0000025445
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS FABRICATED METAL PRODUCTS [3490]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09970
		FILM NUMBER:		10503363

	BUSINESS ADDRESS:	
		STREET 1:		CRANE CO.
		STREET 2:		100 FIRST STAMFORD PLACE
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902
		BUSINESS PHONE:		203-363-7300

	MAIL ADDRESS:	
		STREET 1:		CRANE CO.
		STREET 2:		100 FIRST STAMFORD PLACE
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Crane Merger Co.
		CENTRAL INDEX KEY:			0001479140
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09970
		FILM NUMBER:		10503362

	BUSINESS ADDRESS:	
		STREET 1:		100 FIRST STAMFORD PLACE
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902
		BUSINESS PHONE:		(203) 363-7300

	MAIL ADDRESS:	
		STREET 1:		100 FIRST STAMFORD PLACE
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>c94269_3x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2009-12-23</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000706864</issuerCik>
        <issuerName>MERRIMAC INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>NRM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000025445</rptOwnerCik>
            <rptOwnerName>CRANE CO /DE/</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 FIRST STAMFORD PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06902</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001479140</rptOwnerCik>
            <rptOwnerName>Crane Merger Co.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 FIRST STAMFORD PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06902</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1103765</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">These shares are directly beneficially owned by Crane Merger Co., a wholly owned subsidiary of Crane Co., pursuant to certain Tender and Voting Agreements with several stockholders of the Issuer. For more information, see the Current Report on Form 8-K of Crane Co. filed with the Securities and Exchange Commission on December 24, 2009.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Crane Co., Timothy J. MacCarrick, Chief Financial Officer</signatureName>
        <signatureDate>2010-01-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Crane Merger Co., Timothy J. MacCarrick, Vice President</signatureName>
        <signatureDate>2010-01-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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