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发明名称
Well surveying instruments
摘要
申请公布号
US2886397(A)
申请公布日期
1959.05.12
申请号
US19530380978
申请日期
1953.09.18
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
BUTTERWORTH GILBERT J.;YOUNG EINAR T.
分类号
E21B47/022
主分类号
E21B47/022
代理机构
代理人
主权项
地址
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