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发明名称
Improvements relating to coalcutters
摘要
申请公布号
GB858761(A)
申请公布日期
1961.01.18
申请号
GB19560009622
申请日期
1956.03.28
申请人
MAVOR & COULSON LIMITED
发明人
JERRIT GEORGE
分类号
E21C31/02
主分类号
E21C31/02
代理机构
代理人
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