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发明名称
ENHANCED CIRCULATION DRILL BIT.
摘要
申请公布号
EP0318472(A4)
申请公布日期
1990.02.06
申请号
EP19860905087
申请日期
1986.08.04
申请人
MCCULLOUGH, DOYLE W.
发明人
MCCULLOUGH, DOYLE W.
分类号
B05B3/04;E21B7/18;E21B10/18;E21B21/00
主分类号
B05B3/04
代理机构
代理人
主权项
地址
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