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发明名称
Гидравлический забойный механизм ударного и ударно-вращательного действия
摘要
申请公布号
SU113296(A1)
申请公布日期
1957.11.30
申请号
SU19570579288
申请日期
1957.06.20
申请人
GRAFF L.E.;LITVINOV N.N.
发明人
GRAFF L.E.;LITVINOV N.N.
分类号
E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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