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公开(公告)号：US2978278A
公开(公告)日：1961-04-04
申请号：US79949259
申请日：1959-03-16
Applicant: STAMICARBON
Inventor： DE VOOYS GERARD J , FONTEIN FREERK J
IPC: E21F13/04
CPC classification number: E21F13/042
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