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公开(公告)号：US2851534A
公开(公告)日：1958-09-09
申请号：US27719252
申请日：1952-03-18
Applicant: INT STANDARD ELECTRIC CORP
Inventor： HARRY BRAY FREDERICK , EDGEWORTH BUTLER MICHAEL ARTHU
CPC classification number: H04Q3/42 , H01J2893/007 , H03K17/68 , H04Q3/521
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