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发明名称
ROTARY DRILL BIT
摘要
申请公布号
GB2152557(B)
申请公布日期
1986.07.09
申请号
GB19840031595
申请日期
1984.12.14
申请人
* SANTRADE LIMITED
发明人
LARS KENNETH * BACKLUND
分类号
E21B10/22;E21B10/25;F16J15/32;(IPC1-7):E21B10/22;F16J15/16
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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