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公开(公告)号：US1615935A
公开(公告)日：1927-02-01
申请号：US7501025
申请日：1925-12-12
Applicant: BELL TELEPHONE LABOR INC
Inventor： DAVIS RICHARD C , CONWAY ROY D
IPC: H04M5/12
CPC classification number: H04M5/12
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