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公开(公告)号：US2568164A
公开(公告)日：1951-09-18
申请号：US3584648
申请日：1948-06-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： NOWECK HERMAN E , ROBB THEODORE D
IPC: H04M3/60
CPC classification number: H04M3/60
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公开(公告)号：US3127479A
公开(公告)日：1964-03-31
申请号：US7988560
申请日：1960-12-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： MACURDY WILLIAM B , NOWECK HERMAN E
IPC: H04Q3/62
CPC classification number: H04Q3/625
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