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发明名称
Means for well drilling
摘要
申请公布号
US2839272(A)
申请公布日期
1958.06.17
申请号
US19560569987
申请日期
1956.03.07
申请人
THE WINTER-WEISS COMPANY
发明人
COLQUITT ODIE
分类号
E21B21/12
主分类号
E21B21/12
代理机构
代理人
主权项
地址
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