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公开(公告)号：US2974187A
公开(公告)日：1961-03-07
申请号：US78106258
申请日：1958-12-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： BARRETT EDWARD E , KOLENSKY LEO M , VOTAW CLARENCE J
IPC: H04L12/40
CPC classification number: H04L12/40
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