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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001016317-04-000033.txt : 20041117
<SEC-HEADER>0001016317-04-000033.hdr.sgml : 20041117
<ACCEPTANCE-DATETIME>20041117154552
ACCESSION NUMBER:		0001016317-04-000033
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041115
FILED AS OF DATE:		20041117
DATE AS OF CHANGE:		20041117

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BAGLEY JAMES W
		CENTRAL INDEX KEY:			0001016317

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-12933
		FILM NUMBER:		041152218

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		510 572 0200

	MAIL ADDRESS:	
		STREET 1:		LAM RESEARCH
		STREET 2:		4650 CUSHING PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LAM RESEARCH CORP
		CENTRAL INDEX KEY:			0000707549
		STANDARD INDUSTRIAL CLASSIFICATION:	SPECIAL INDUSTRY MACHINERY, NEC [3559]
		IRS NUMBER:				942634797
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		4650 CUSHING BLVD
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538
		BUSINESS PHONE:		5106590200

	MAIL ADDRESS:	
		STREET 1:		4650 CUSHING PARKWAY
		CITY:			FREMONT
		STATE:			CA
		ZIP:			94538
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
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                <value>2004-11-16</value>
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                <value>2004-11-16</value>
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                <value>2006-11-21</value>
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                <underlyingSecurityTitle>
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                <sharesOwnedFollowingTransaction>
                    <value>2425000</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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    <footnotes>
        <footnote id="F1">Stock Option is 100% vested as of 10/17/04.</footnote>
        <footnote id="F2">Stock Option is 100% vested as of 3/1/02.</footnote>
        <footnote id="F3">Shares sold pursuant to 10b5-1 Sales Plan dated 3/12/04.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Kym Hall by Power of Attorney</signatureName>
        <signatureDate>2004-11-17</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----