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公开(公告)号：US2531391A
公开(公告)日：1950-11-28
申请号：US70902646
申请日：1946-11-09
Applicant: INT STANDARD ELECTRIC CORP
Inventor： HARRY BRAY FREDERICK , FREDERICK BATES ERNEST , CONNELL DOUGHTY JOHN
CPC classification number: G08B25/045 , G08B17/06
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