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公开(公告)号：US3377432A
公开(公告)日：1968-04-09
申请号：US38658964
申请日：1964-07-31
Applicant: BELL TELEPHONE LABOR INC
Inventor： ABBOTT HENRY H , FETTE CHARLES J , MEISE JR HENRY A
IPC: H04Q3/54
CPC classification number: H04Q3/54
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