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公开(公告)号：US2254838A
公开(公告)日：1941-09-02
申请号：US22891638
申请日：1938-09-08
Applicant: RCA CORP
Inventor： CONKLIN JAMES W , ALFRED MENEELY
IPC: H01C1/082
CPC classification number: H01C1/082
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