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发明名称
Коническая шарошка для долота, применяемого при бурении шахт
摘要
申请公布号
SU74093(A1)
申请公布日期
1948.11.30
申请号
SU19470000117
申请日期
1947.04.14
申请人
SHCHEPOTEV K.N.
发明人
SHCHEPOTEV K.N.
分类号
E21B10/08;E21D1/06
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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