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经营范围
发明名称
Improvements in or relating to mining machinery
摘要
申请公布号
GB703657(A)
申请公布日期
1954.02.10
申请号
GB19510014998
申请日期
1951.06.25
申请人
JOY-SULLIVAN LIMITED;DAVID MARR
发明人
分类号
E21C35/19
主分类号
E21C35/19
代理机构
代理人
主权项
地址
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