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1.发明授权
公开(公告)号：US3405311A
公开(公告)日：1968-10-08
申请号：US56996466
申请日：1966-08-03
Applicant: BELL TELEPHONE LABOR INC
Inventor： BRAINARD RALPH C , BROWN EARL F
IPC: H04N7/14
CPC classification number: H04N7/141
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