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发明名称
Means for drilling wells
摘要
申请公布号
US2126189(A)
申请公布日期
1938.08.09
申请号
US19350056607
申请日期
1935.12.30
申请人
BERGER GOLDMAN OTTO
发明人
GOLDMAN OTTO BERGER
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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