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发明名称
Well surveying instrument
摘要
申请公布号
US2268682(A)
申请公布日期
1942.01.06
申请号
US19370168195
申请日期
1937.10.09
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
WEBB EARNEST RAY
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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