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发明名称
Inclination indicating device for oil wells
摘要
申请公布号
US1988741(A)
申请公布日期
1935.01.22
申请号
US19300466126
申请日期
1930.07.07
申请人
HARRY R. STAPLES
发明人
LYNCH THEODORE L.;RILLING HARRY L.;REDFIELD HOWARD A.
分类号
E21B47/022
主分类号
E21B47/022
代理机构
代理人
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地址
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