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发明名称
Improvements in or relating to mining machines
摘要
申请公布号
GB647870(A)
申请公布日期
1950.12.20
申请号
GB19480030881
申请日期
1948.11.29
申请人
ALEXANDER ANDERSON;ANDERSON, BOYES & COMPANY LIMITED
发明人
分类号
E21C27/02
主分类号
E21C27/02
代理机构
代理人
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地址
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