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公开(公告)号：US2017654A
公开(公告)日：1935-10-15
申请号：US56936031
申请日：1931-10-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： COY JAY A , ROMNES HAAKON I
IPC: H04B3/11
CPC classification number: H04B3/11
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