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公开(公告)号：US1898995A
公开(公告)日：1933-02-28
申请号：US50017230
申请日：1930-12-05
Applicant: RCA CORP
Inventor： CASS JOHN L , BARTON KREUZER
IPC: G03B21/56
CPC classification number: G03B21/565
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