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发明名称
Drill bit
摘要
申请公布号
AU644241(B2)
申请公布日期
1993.12.02
申请号
AU19910088076
申请日期
1991.11.22
申请人
AULETTE STEWART
发明人
AULETTE STEWART
分类号
E21B10/48;(IPC1-7):E21B10/46
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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