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发明名称
Improvements in coal cutting machines
摘要
申请公布号
GB332611(A)
申请公布日期
1930.07.25
申请号
GB19290012830
申请日期
1929.04.25
申请人
LUCAS BUTTERWORTH;ERNEST HOWE LAWSON
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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