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公开(公告)号：US1853022A
公开(公告)日：1932-04-12
申请号：US48715430
申请日：1930-10-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： ALLISON SEWELL W , MCCULLAGH WILLIS I
IPC: H04M3/32
CPC classification number: H04M3/323
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