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公开(公告)号：US3550238A
公开(公告)日：1970-12-29
申请号：US3550238D
申请日：1968-03-28
Applicant: USM CORP
Inventor： ALLEN MELVIN K , GUNST OLE , LAMBERT ARTHUR H
CPC classification number: H05K13/0439 , Y10T29/5137 , Y10T29/53183
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