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公开(公告)号：US2098402A
公开(公告)日：1937-11-09
申请号：US70048433
申请日：1933-12-01
Applicant: RCA CORP
Inventor： REIFSTECK CARL N , DIMMICK GLENN L
IPC: H04M1/03
CPC classification number: H04M1/03
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