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公开(公告)号：US2279335A
公开(公告)日：1942-04-14
申请号：US35082440
申请日：1940-08-03
Applicant: WESTERN UNION TELEGRAPH CO
Inventor： MORGENSTERN RONALD V , GILBERT HENRY P
IPC: H04L12/00
CPC classification number: H04L12/00
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