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发明名称
ROCK DRILL
摘要
申请公布号
IE840827(L)
申请公布日期
1984.10.05
申请号
IE19840000827
申请日期
1984.04.04
申请人
SANTRADE LTD
发明人
分类号
E21B10/52;E21B10/56;(IPC1-7):E21B10/56
主分类号
E21B10/52
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