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公开(公告)号：US3449053A
公开(公告)日：1969-06-10
申请号：US3449053D
申请日：1965-04-29
Applicant: MC DONNELL DOUGLAS CORP
Inventor： CANNADY SAMUEL J , FISHER DONALD C , HAMILTON VERN E
CPC classification number: G02B21/002 , G01N21/5911
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