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公开(公告)号：US3492093A
公开(公告)日：1970-01-27
申请号：US3492093D
申请日：1968-08-07
Applicant: FMC CORP
Inventor： TRENTON JOHN F START , SEGLIN LEONARD , FRANKO-FILIPASIC BORIVOJ R
CPC classification number: C01B13/0214
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