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公开(公告)号：US1964588A
公开(公告)日：1934-06-26
申请号：US69755333
申请日：1933-11-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： MCCANDLESS CLARENCE H
IPC: H04Q3/00
CPC classification number: H04Q3/00
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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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