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公开(公告)号：US1403759A
公开(公告)日：1922-01-17
申请号：US36185820
申请日：1920-02-27
Applicant: JOHN FITZPATRICK
Inventor： JOHN FITZPATRICK
IPC: C01B13/11
CPC classification number: C01B13/11 , C01B2201/74
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