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1.发明授权
公开(公告)号：US3341662A
公开(公告)日：1967-09-12
申请号：US32584263
申请日：1963-11-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： CERNY LOUIS J , ORFEO CESAREO , CURTIS ROBERT B , NIGHTINGALE JOHN G , PARKINSON JR FREDERICK H
IPC: H04Q3/00
CPC classification number: H04Q3/0016
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