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公开(公告)号：US2472610A
公开(公告)日：1949-06-07
申请号：US78654447
申请日：1947-11-17
Applicant: SHELL DEV
Inventor： NIXON ALAN C , LEHWALDER DAVID C , CHENEY HARRY A
CPC classification number: C01B7/0712 , B01J19/02 , B01J2219/0236
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