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经营范围
发明名称
ROTERENDE GRONDBOOR.
摘要
申请公布号
NL8301061(A)
申请公布日期
1983.10.17
申请号
NL19830001061
申请日期
1983.03.25
申请人
TREND ROCK BIT ALBERTA, LTD. TE VICTORIA, CANADA.
发明人
分类号
E21B10/20;E21B10/22;(IPC1-7):E21B10/22
主分类号
E21B10/20
代理机构
代理人
主权项
地址
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