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发明名称
Well-drilling rig
摘要
申请公布号
US2675995(A)
申请公布日期
1954.04.20
申请号
US19480011630
申请日期
1948.02.27
申请人
GEISER CHARLES E
发明人
GEISER CHARLES E.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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