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发明名称
DOWN HOLE DRILLS USING SPENT DRIVING FLUID FOR FLUSHING PURPOSES
摘要
申请公布号
US5107944(A)
申请公布日期
1992.04.28
申请号
US19910692212
申请日期
1991.04.26
申请人
GUSTAFSSON, PER
发明人
GUSTAFSSON, PER
分类号
E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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