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经营范围
发明名称
Improvements in or relating to a mining machine head
摘要
申请公布号
GB675440(A)
申请公布日期
1952.07.09
申请号
GB19500017552
申请日期
1950.07.13
申请人
CHARLES EDWARD COMPTON
发明人
分类号
E21C25/58
主分类号
E21C25/58
代理机构
代理人
主权项
地址
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