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发明名称
DOWNHOLE SHEARERS
摘要
申请公布号
IE802193(L)
申请公布日期
1981.04.25
申请号
IE19800002193
申请日期
1980.10.23
申请人
FREDERICK FLETCHER AND HILDA MAY SMITHURST
发明人
分类号
E21B7/20;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
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地址
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