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公开(公告)号：US2825030A
公开(公告)日：1958-02-25
申请号：US7156649
申请日：1949-01-19
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： WILLIAM ALTAR , PATRICK CONLEY
IPC: H04L27/12
CPC classification number: H04L27/12
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