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公开(公告)号：US3348926A
公开(公告)日：1967-10-24
申请号：US13022761
申请日：1961-08-03
Applicant: IIT RES INST
Inventor： NIELSEN ERIK R , STEPP WILLIAM L
IPC: C01B21/098
CPC classification number: C01B21/0986
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