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发明名称
Whip stock removing device
摘要
申请公布号
US2107420(A)
申请公布日期
1938.02.08
申请号
US19370166064
申请日期
1937.09.28
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
KOTHNY GOTTDANK L.
分类号
E21B7/06;E21B7/08;E21B23/00;E21B31/12
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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