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公开(公告)号：US3011156A
公开(公告)日：1961-11-28
申请号：US81646159
申请日：1959-05-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： MACPHERSON DONALD H
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公开(公告)号：US2863950A
公开(公告)日：1958-12-09
申请号：US43277054
申请日：1954-05-27
Applicant: AMERICAN TELEPHONE & TELEGRAPH , BELL TELEPHONE LABOR INC
Inventor： DUNNING SANFORD F , MACPHERSON DONALD H
CPC classification number: H04M1/6515 , H04M3/54
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公开(公告)号：US2820104A
公开(公告)日：1958-01-14
申请号：US45584454
申请日：1954-09-14
Applicant: BELL TELEPHONE LABOR INC
Inventor： MACPHERSON DONALD H , MCCANDLESS CLARENCE H , NEWSOM JAMES B
IPC: H04Q3/42
CPC classification number: H04Q3/42
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