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发明名称
Drill Bit
摘要
申请公布号
CA2056049(A1)
申请公布日期
1992.05.24
申请号
CA19912056049
申请日期
1991.11.22
申请人
STEWART, AULETTE
发明人
STEWART, AULETTE
分类号
E21B10/48;(IPC1-7):E21B10/00
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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