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公开(公告)号：US3327064A
公开(公告)日：1967-06-20
申请号：US33590064
申请日：1964-01-06
Applicant: BELL TELEPHONE LABOR INC
Inventor： BRAUND REED J , GAGNE DONALD J , MATTHEWS VINCENT J
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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