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发明名称
Whipstock
摘要
申请公布号
US2331293(A)
申请公布日期
1943.10.12
申请号
US19410417897
申请日期
1941.11.05
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
BALLARD HYDE W.
分类号
E21B7/06;E21B7/08
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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