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公开(公告)号：US2025904A
公开(公告)日：1935-12-31
申请号：US71939434
申请日：1934-04-06
Applicant: GEORGE RUCK
Inventor： GEORGE RUCK
IPC: C01B13/11
CPC classification number: C01B13/11 , C01B2201/14
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