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公开(公告)号：US3435213A
公开(公告)日：1969-03-25
申请号：US3435213D
申请日：1965-07-19
Applicant: BELL TELEPHONE LABOR INC
Inventor： COLBOW KONRAD , GARRETT CHARLES G B , THOMAS DONALD E
CPC classification number: G01N21/6408 , G02B26/04
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