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公开(公告)号：US3099720A
公开(公告)日：1963-07-30
申请号：US7931260
申请日：1960-12-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： GOTTHARDT MANFRED R
IPC: H04Q3/42
CPC classification number: H04Q3/42
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公开(公告)号：US3047668A
公开(公告)日：1962-07-31
申请号：US7943860
申请日：1960-12-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： GOTTHARDT MANFRED R , LOWRY TERRELL N
IPC: H04Q3/58
CPC classification number: H04Q3/58
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