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公开(公告)号：US1927425A
公开(公告)日：1933-09-19
申请号：US28146828
申请日：1928-05-29
Applicant: RCA CORP
Inventor： DER MARK JAN VAN , DER POL BALTHAZAR VAN
IPC: H03B19/16
CPC classification number: H03B19/16
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