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公开(公告)号：US2391210A
公开(公告)日：1945-12-18
申请号：US45339642
申请日：1942-08-03
Applicant: KAPELLA LTD
Inventor： ARTHUR WARMISHAM , GORRIE WYNNE CHARLES
IPC: G02B21/00
CPC classification number: G02B21/0016
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