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公开(公告)号：US2066514A
公开(公告)日：1937-01-05
申请号：US7602036
申请日：1936-04-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： BEYER JESSE W , TERRY DONALD M
IPC: H04B3/10
CPC classification number: H04B3/10 , Y10T307/484
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