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公开(公告)号：US1698324A
公开(公告)日：1929-01-08
申请号：US52989522
申请日：1922-01-17
Applicant: TEXAS CO
Inventor： TAVEAU RENE DE M , TYGERT CYRIL B
IPC: C01F7/60
CPC classification number: C01F7/60
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