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发明名称
Well drilling structure provided with a drill pipe hoist
摘要
申请公布号
US2531930(A)
申请公布日期
1950.11.28
申请号
US19470789254
申请日期
1947.12.02
申请人
LEE C. MOORE CORPORATION
发明人
WOOLSLAYER HOMER J.;JENKINS CECIL
分类号
E21B19/14
主分类号
E21B19/14
代理机构
代理人
主权项
地址
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