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发明名称
ROCK DRILLING DEVICE
摘要
申请公布号
CA709737(A)
申请公布日期
1965.05.18
申请号
CAD709737
申请日期
申请人
NILS T. NELDAS
发明人
ERIK O. PERSSON
分类号
主分类号
代理机构
代理人
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