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公开(公告)号：US3447327A
公开(公告)日：1969-06-03
申请号：US3447327D
申请日：1967-01-18
Applicant: STAMICARBON
Inventor： FONTEIN FREERK J , LOONEN HENDRIK E , CREUELS FRANS H
CPC classification number: E21D23/0052 , E21D23/0409
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