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公开(公告)号：US1328221A
公开(公告)日：1920-01-13
申请号：US17089917
申请日：1917-05-25
Applicant: ZAHM MFG COMPANY
Inventor： EDWARD ZAHM
IPC: B01D29/11
CPC classification number: B01D29/111 , B01D29/33 , B01D29/52 , B01D2201/043 , B01D2201/34
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