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公开(公告)号：US3402979A
公开(公告)日：1968-09-24
申请号：US44402865
申请日：1965-03-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： YOH-HAN PAO , RENTZEPIS PETER M
IPC: G02B5/30
CPC classification number: G02B5/3058
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