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公开(公告)号：US3335229A
公开(公告)日：1967-08-08
申请号：US32159763
申请日：1963-11-05
Applicant: BELL TELEPHONE LABOR INC
Inventor： BURKE PAUL J , HOPPER KENNETH D , SCHWENZFEGER EDWARD E
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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