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公开(公告)号：US3102930A
公开(公告)日：1963-09-03
申请号：US79926059
申请日：1959-03-13
Applicant: BELL TELEPHONE LABOR INC
Inventor： ANDERSON LYNN T , CRANE JR ERNEST G
IPC: H04Q3/62
CPC classification number: H04Q3/625
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