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经营范围
发明名称
HOLE-BOTTOM SCREW ENGINE
摘要
申请公布号
SU899819(A1)
申请公布日期
1982.01.23
申请号
SU19772543577
申请日期
1977.11.16
申请人
PERMSKIJ VNII BUROVOJ TEKHNIKI
发明人
KRUTIK ERNST N,SU;KOCHNEV ANATOLIJ M,SU;DERKACH NIKOLAJ D,SU;NIKOMAROV SAMUIL S,SU
分类号
E21B4/00;(IPC1-7):E21B4/00
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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