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经营范围
发明名称
Drill bit air clearing system
摘要
申请公布号
GB2019921(A)
申请公布日期
1979.11.07
申请号
GB19790010560
申请日期
1979.03.27
申请人
REED TOOL CO
发明人
分类号
E21B10/18;E21B10/22;E21B10/25;(IPC1-7):E21B9/10
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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