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公开(公告)号：US2464887A
公开(公告)日：1949-03-22
申请号：US64072246
申请日：1946-01-12
Applicant: AMERICAN OPTICAL CORP
Inventor： HAROLD OSTERBERG , ROEBUCK JOHN R , COLLYER PHILIP W
IPC: G03B21/16
CPC classification number: G03B21/16
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