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发明名称
Вертлюг для буровых скважин
摘要
申请公布号
SU68597(A1)
申请公布日期
1946.11.30
申请号
SU19460345685
申请日期
1946.06.01
申请人
SMYSHLYAEV L.E.
发明人
SMYSHLYAEV L.E.
分类号
E21B21/02
主分类号
E21B21/02
代理机构
代理人
主权项
地址
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