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发明名称
SNIJ-ELEMENT VOOR EEN BOORBEITEL VOOR GRONDBORINGEN IN BODEMFORMATIES.
摘要
申请公布号
NL8200680(A)
申请公布日期
1982.10.18
申请号
NL19820000680
申请日期
1982.02.19
申请人
CHRISTENSEN, INC. TE SALT LAKE CITY, UTAH, VER. ST. V. AM.
发明人
分类号
E21B10/56;E21B10/567;(IPC1-7):E21B10/46
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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