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发明名称
Well surveying device
摘要
申请公布号
US2134808(A)
申请公布日期
1938.11.01
申请号
US19290391723
申请日期
1929.09.11
申请人
SPERRY-SUN WELL SURVEYING COMPANY
发明人
WINN WILLIAM E.
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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