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公开(公告)号：US3231683A
公开(公告)日：1966-01-25
申请号：US25094863
申请日：1963-01-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： LOWRY TERRELL N , MACK JOHN E , MAY HAROLD F , SMATHERS JOHN E
IPC: H04Q3/42
CPC classification number: H04Q3/42
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