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公开(公告)号：US3418631A
公开(公告)日：1968-12-24
申请号：US46138165
申请日：1965-06-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： SIPRESS JACK M , EGILS ZARINS
IPC: H04L25/49
CPC classification number: H04L25/4925
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