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公开(公告)号：US2494082A
公开(公告)日：1950-01-10
申请号：US75774147
申请日：1947-06-28
Applicant: HONORARY ADVISORY COUNCIL SCI
Inventor： MCCLURE BAIRD KENNETH
IPC: G03B39/04
CPC classification number: G03B39/04
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