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公开(公告)号：US2670365A
公开(公告)日：1954-02-23
申请号：US7991149
申请日：1949-03-05
Applicant: STANDARD OIL DEV CO
Inventor： WATTS RHEA N , GRAY C F
IPC: B01J23/78
CPC classification number: B01J23/78
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