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公开(公告)号：US3364433A
公开(公告)日：1968-01-16
申请号：US62219967
申请日：1967-03-10
Applicant: BELL TELEPHONE LABOR INC
Inventor： ISAAC FREUND , RENTZEPIS PETER M
CPC classification number: G02F1/0045 , G02F1/361 , G02F1/39
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