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公开(公告)号：US2054789A
公开(公告)日：1936-09-22
申请号：US72762834
申请日：1934-05-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： CHESNUT ROY W , CRANE RALPH E , HUBER GEORGE H
IPC: H04J1/12
CPC classification number: H04J1/12
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