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公开(公告)号：US2107756A
公开(公告)日：1938-02-08
申请号：US14281537
申请日：1937-05-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： KENDALL BURTON W , DOREN MITCHELL
IPC: H04K1/02
CPC classification number: H04K1/02
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