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公开(公告)号：US2298939A
公开(公告)日：1942-10-13
申请号：US27838039
申请日：1939-06-09
Applicant: INT STANDARD ELECTRIC CORP
Inventor： BALMAIN GRIFFITHS JOHN , JOHN TERVET ERNEST
IPC: B61L25/04
CPC classification number: B61L25/04
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