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公开(公告)号：US2947815A
公开(公告)日：1960-08-02
申请号：US62943656
申请日：1956-12-18
Applicant: BELL TELEPHONE LABOR INC
Inventor： BAKER GEORGE H , DOREN MITCHELL , REIHING JR JOHN V
IPC: H04L1/20
CPC classification number: H04L1/20
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