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公开(公告)号：US3484722A
公开(公告)日：1969-12-16
申请号：US3484722D
申请日：1966-11-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： BARKER ALFRED S JR , VERLEUR HANS W
CPC classification number: G02F1/0147 , G02F1/19
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