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经营范围
发明名称
Well drilling apparatus
摘要
申请公布号
US3291230(A)
申请公布日期
1966.12.13
申请号
US19650496988
申请日期
1965.10.18
申请人
CULLEN
发明人
CULLEN ROY H.;ELLIOTT CHARLES H.;AKER JIMMIE R.;GILCHRIST THOMAS J.
分类号
E21B4/04
主分类号
E21B4/04
代理机构
代理人
主权项
地址
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