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经营范围
发明名称
GRONDBOORBEITEL.
摘要
申请公布号
NL7706233(A)
申请公布日期
1978.01.16
申请号
NL19770006233
申请日期
1977.06.07
申请人
CHRISTENSEN, INC. TE SALT LAKE CITY, UTAH, VER. ST. V. AM.
发明人
分类号
E21B10/46;E21B10/56;E21B10/567;(IPC1-7):E21B9/36
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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