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发明名称
Electrical connecting means for well bore apparatus
摘要
申请公布号
US2339274(A)
申请公布日期
1944.01.18
申请号
US19390289348
申请日期
1939.08.10
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
KOTHNY GOTTDANK L.
分类号
E21B4/04;E21B17/02
主分类号
E21B4/04
代理机构
代理人
主权项
地址
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