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1.发明授权
公开(公告)号：US2053231A
公开(公告)日：1936-09-01
申请号：US3871935
申请日：1935-08-31
Applicant: KAPELLA LTD
Inventor： WILLIAM TAYLER
IPC: G02B7/04
CPC classification number: G02B7/04 , Y10T74/18584
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