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公开(公告)号：US3504129A
公开(公告)日：1970-03-31
申请号：US3504129D
申请日：1967-01-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： EWIN JAMES C , HOOD ANDREW A , LANDIS EDWARD W
CPC classification number: H04Q3/545
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