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发明名称
ROCK DRILLING OPERATION
摘要
申请公布号
CA318713(A)
申请公布日期
1932.01.05
申请号
CAD318713
申请日期
申请人
MINIMAX A.G.
发明人
FRANZ SCHURMEYER
分类号
主分类号
代理机构
代理人
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