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公开(公告)号：US2543062A
公开(公告)日：1951-02-27
申请号：US76574647
申请日：1947-08-02
Applicant: INT STANDARD ELECTRIC CORP
Inventor： TUXEN RINGKJOB RAGNAR ERLING , WILLY POULIART
IPC: H04Q5/02
CPC classification number: H04Q5/02
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