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经营范围
发明名称
Apparatus for washing over, releasing, and withdrawing tubular tructures from wells
摘要
申请公布号
US2449841(A)
申请公布日期
1948.09.21
申请号
US19470732860
申请日期
1947.03.06
申请人
CLAYPOOL ROBBINS M;BEST DAVID M
发明人
CLAYPOOL ROBBINS M.;BEST DAVID M.
分类号
E21B17/06;E21B31/00
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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