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公开(公告)号：US2267961A
公开(公告)日：1941-12-30
申请号：US23647838
申请日：1938-10-22
Applicant: AMERICAN OPTICAL CORP
Inventor： TILLYER EDGAR D , WHITE CARL B
CPC classification number: G01M11/0278 , G01M11/0214 , G01N21/958 , G01N2033/0081
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