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经营范围
发明名称
Rotary earth drilling apparatus and method
摘要
申请公布号
US2948514(A)
申请公布日期
1960.08.09
申请号
US19550508959
申请日期
1955.05.17
申请人
LONG GEBHARD J
发明人
LONG GEBHARD J.
分类号
E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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