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公开(公告)号：US2596584A
公开(公告)日：1952-05-13
申请号：US13338249
申请日：1949-12-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： MICHAEL HENRY J , WILEY WHITTNEY
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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