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发明名称
Method of and apparatus for orienting well-holes
摘要
申请公布号
US1959666(A)
申请公布日期
1934.05.22
申请号
US19300417995
申请日期
1930.01.02
申请人
GRANT EDWIN J
发明人
GRANT EDWIN J.
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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