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公开(公告)号：US3457417A
公开(公告)日：1969-07-22
申请号：US3457417D
申请日：1967-06-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： BUCHSBAUM SOLOMON J , MCFEE JAMES H , TIEN PING K
CPC classification number: G02F1/37
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