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公开(公告)号：US2221273A
公开(公告)日：1940-11-12
申请号：US23564538
申请日：1938-10-18
Applicant: STRASBURGER CHARLES M
Inventor： STRASBURGER CHARLES M
IPC: C02F1/68
CPC classification number: C02F1/686 , C02F1/687 , Y10T137/2519
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