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公开(公告)号：US3419683A
公开(公告)日：1968-12-31
申请号：US50077465
申请日：1965-10-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： MICHAEL HENRY J , MORSE CHARLES E , ORAM FRANK G , ROCCATI EDGAR J , SMITH JOHN P
IPC: H04Q3/58
CPC classification number: H04Q3/58
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