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公开(公告)号：US1938639A
公开(公告)日：1933-12-12
申请号：US58443632
申请日：1932-01-02
Applicant: RCA CORP
Inventor： KLAAS POSTHUMUS , JESEPHUS WEYERS THEODORUS
IPC: H03H7/01
CPC classification number: H03H7/0161
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