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发明名称
ROCK CUTTING TOOLS
摘要
申请公布号
GB1584752(A)
申请公布日期
1981.02.18
申请号
GB19770022129
申请日期
1977.05.25
申请人
TRANSPORT SECRETARY OF STATE FOR
发明人
分类号
E21B10/12;E21B10/20;E21B10/22;E21D9/10;(IPC1-7):E21C25/18
主分类号
E21B10/12
代理机构
代理人
主权项
地址
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