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公开(公告)号：US2476494A
公开(公告)日：1949-07-19
申请号：US57925645
申请日：1945-02-22
Applicant: RCA CORP
Inventor： JONES HORACE R , WILBY EDWARD W
IPC: G03B21/30
CPC classification number: G03B21/30
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