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公开(公告)号：US1674364A
公开(公告)日：1928-06-19
申请号：US18474327
申请日：1927-04-18
Applicant: ARTHUR L JOFFEE
Inventor： BUXTON HARTMAN HARRY
IPC: C02F1/461
CPC classification number: C02F1/46104 , C02F1/46109 , C02F2001/46152 , C02F2201/4611
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