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公开(公告)号：US3116375A
公开(公告)日：1963-12-31
申请号：US84859559
申请日：1959-10-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： HARR JOHN A , LOWRY TERRELL N , NEHAMA ISAAC D , RIDINGER PHILIP G
IPC: H04Q3/52
CPC classification number: H04Q3/521
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