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公开(公告)号：US3389384A
公开(公告)日：1968-06-18
申请号：US51079265
申请日：1965-12-01
Applicant: NAT RES DEV
Inventor： FAULKNER JONES GLYN , RICHARD HOFFMAN GEORGE
CPC classification number: G11C11/44 , Y10S505/84
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