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发明名称
Двух шарошечное поворотное долото для бурения скважин
摘要
申请公布号
SU109274(A2)
申请公布日期
1956.11.30
申请号
SU19560575156
申请日期
1956.02.14
申请人
DIFFINE E.A.;KERSHENBAUM YA.M.
发明人
DIFFINE E.A.;KERSHENBAUM YA.M.
分类号
E21B10/20
主分类号
E21B10/20
代理机构
代理人
主权项
地址
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