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公开(公告)号：US2912485A
公开(公告)日：1959-11-10
申请号：US65088957
申请日：1957-04-05
Applicant: BELL TELEPHONE LABOR INC
Inventor： KAUFMAN ARTHUR W , VOTAW CLARENCE J
IPC: H04L12/40
CPC classification number: H04L12/40
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