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发明名称
Positioning device for drilling cuts in shafts and sumps in mine sinking work
摘要
申请公布号
US2884701(A)
申请公布日期
1959.05.05
申请号
US19560591134
申请日期
1956.06.13
申请人
WILHELM DUDA
发明人
DUDA WILHELM
分类号
E21B19/24
主分类号
E21B19/24
代理机构
代理人
主权项
地址
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