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公开(公告)号：US2346550A
公开(公告)日：1944-04-11
申请号：US35199240
申请日：1940-08-09
Applicant: SHELL DEV
Inventor： BORDER LAWSON E , GERHART EDWIN T
IPC: C01B17/32
CPC classification number: C01B17/32 , C01P2006/80
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