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发明名称
ROTARY DRILL BITS
摘要
申请公布号
US5109935(A)
申请公布日期
1992.05.05
申请号
US19900616636
申请日期
1990.11.21
申请人
REED TOOL COMPANY LIMITED
发明人
HAWKE, LESLIE R.
分类号
E21B10/54;E21B10/55;E21B10/56;E21B10/567;E21B10/60;E21B17/10
主分类号
E21B10/54
代理机构
代理人
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