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发明名称
ROTARY EARTH BORING BIT
摘要
申请公布号
GB1546198(A)
申请公布日期
1979.05.16
申请号
GB19760022796
申请日期
1976.06.02
申请人
SHELL INT RES MAATSCHAPPIJ BV
发明人
分类号
E21B10/46;E21B10/58;(IPC1-7):E21B9/02;E21B9/36
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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