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发明名称
Lubricated well drill
摘要
申请公布号
US2831660(A)
申请公布日期
1958.04.22
申请号
US19560578403
申请日期
1956.04.16
申请人
NATIONAL OIL TOOL CO., INC.
发明人
SMIECINSKI CASIMIR T.
分类号
E21B10/23;E21B10/24
主分类号
E21B10/23
代理机构
代理人
主权项
地址
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