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公开(公告)号：US3159716A
公开(公告)日：1964-12-01
申请号：US22661662
申请日：1962-09-27
Applicant: BELL TELEPHONE LABOR INC
Inventor： GEORGE RIDDELL , THROCKMORTON CHARLES A
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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