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公开(公告)号：US3490390A
公开(公告)日：1970-01-20
申请号：US3490390D
申请日：1968-02-06
Applicant: RANDMAKER IMPLEMENTS PROPRIETA
Inventor： TOIT ANDRIES PRETORIUS DU
CPC classification number: B30B11/208 , B30B11/201
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