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公开(公告)号：US2761037A
公开(公告)日：1956-08-28
申请号：US29015652
申请日：1952-05-27
Applicant: THOMAS KENNETH H , EATON CHARLES C
Inventor： THOMAS KENNETH H , EATON CHARLES C
CPC classification number: E03F7/00 , E03F2201/40 , H01H35/34
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