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公开(公告)号：US2421393A
公开(公告)日：1947-06-03
申请号：US42795642
申请日：1942-01-23
Applicant: FRANCOIS SAVOYE
Inventor： FRANCOIS SAVOYE
IPC: G03B35/24
CPC classification number: G03B35/24
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公开(公告)号：US2441674A
公开(公告)日：1948-05-18
申请号：US60487045
申请日：1945-07-13
Applicant: FRANCOIS SAVOYE
Inventor： FRANCOIS SAVOYE
IPC: G03B35/00
CPC classification number: G03B35/00
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