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经营范围
发明名称
Well drilling apparatus
摘要
申请公布号
US3260318(A)
申请公布日期
1966.07.12
申请号
US19630322596
申请日期
1963.11.12
申请人
SMITH INDUSTRIES INTERNATIONAL, INC.
发明人
NEILSON WILLIAM J.;GARRISON ERSKINE P.;SMITH GAYLE D.
分类号
E21B4/02;E21B7/08
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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