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发明名称
Travelling controlling apparatus for underground mineworks or the like
摘要
申请公布号
US2711305(A)
申请公布日期
1955.06.21
申请号
US19510207550
申请日期
1951.01.24
申请人
KARL HENKEL
发明人
HENKEL KARL
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
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地址
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