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发明名称
Improvement in well tools
摘要
申请公布号
US2327362(A)
申请公布日期
1943.08.24
申请号
US19400359862
申请日期
1940.10.05
申请人
WELL TOOL DEVELOPMENT CORPORATION
发明人
MCDONALD JOSEPH S.;RUSKA WALTER E. A.
分类号
E21B43/112
主分类号
E21B43/112
代理机构
代理人
主权项
地址
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