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公开(公告)号：US2957982A
公开(公告)日：1960-10-25
申请号：US67846257
申请日：1957-08-05
Applicant: RCA CORP
Inventor： SONNENFELDT RICHARD W , DALY ELEANOR K
IPC: H03D1/24
CPC classification number: H03D1/24
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