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发明名称
DIAMOND DRILL BIT WITH VARIED CUTTING ELEMENTS
摘要
申请公布号
EP0164297(B1)
申请公布日期
1989.06.07
申请号
EP19850630003
申请日期
1985.01.18
申请人
HUGHES TOOL COMPANY
发明人
WEAVER, GARY EUGENE
分类号
E21B10/42;E21B10/43;E21B10/46;E21B10/56;E21B10/567
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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