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公开(公告)号：US1284488A
公开(公告)日：1918-11-12
申请号：US10302116
申请日：1916-06-10
Applicant: STEWARD ROY F
Inventor： STEWARD ROY F
CPC classification number: B01J19/1887 , B01J10/02 , B01J16/00 , B01J19/123
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