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公开(公告)号：US3128349A
公开(公告)日：1964-04-07
申请号：US5091660
申请日：1960-08-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： BOESCH FRANCIS T , NASH DONALD H , LEO SCHENKER
IPC: H04Q1/453
CPC classification number: H04Q1/453
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