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经营范围
发明名称
Straight hole drill collar
摘要
申请公布号
US2542725(A)
申请公布日期
1951.02.20
申请号
US19490115066
申请日期
1949.09.10
申请人
NOBLE DRILLING CORPORATION
发明人
STEWART LEONARD E.;WINTERS MARVIN J.
分类号
E21B17/16
主分类号
E21B17/16
代理机构
代理人
主权项
地址
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