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发明名称
DRILLING TEETH ASSEMBLY OF A LARGE-DIAMETER DRILL
摘要
申请公布号
PL267116(A1)
申请公布日期
1989.02.06
申请号
PL19870267116
申请日期
1987.07.30
申请人
发明人
分类号
E21B;E21B10/08;(IPC1-7):E21B/
主分类号
E21B
代理机构
代理人
主权项
地址
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