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公开(公告)号：US2104449A
公开(公告)日：1938-01-04
申请号：US9553036
申请日：1936-08-12
Applicant: GRACE MACDONALD STOKELY , BELL TELEPHONE LABOR INC
Inventor： BOWNE LANGFORD J , HOWARD BEACH , LAMBERTY FREDERICK R
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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