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公开(公告)号：US1721250A
公开(公告)日：1929-07-16
申请号：US67720223
申请日：1923-11-27
Applicant: ERNEST J SWEETLAND
Inventor： GEORGE GREENHALGH
CPC classification number: B01D25/02 , B01D29/39 , B01D35/1573 , B01D2201/208
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