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公开(公告)号：US3525006A
公开(公告)日：1970-08-18
申请号：US3525006D
申请日：1968-02-29
Applicant: NAT RES DEV
Inventor： PARR NORMAN LAWRENCE , BOLSHAW SAM , MAY EDWIN RICHARD WELLS
CPC classification number: H01R39/24
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