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公开(公告)号：US2948377A
公开(公告)日：1960-08-09
申请号：US70411557
申请日：1957-12-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： KENNEDY WILLIAM J
IPC: H04M17/02
CPC classification number: H04M17/026
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公开(公告)号：US2922571A
公开(公告)日：1960-01-26
申请号：US72276858
申请日：1958-03-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： KENNEDY WILLIAM J , WILLIAM PFERD
CPC classification number: H04M17/026 , G07F9/04
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