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发明名称
Improvements in or relating to coal mining machinery
摘要
申请公布号
GB329117(A)
申请公布日期
1930.05.15
申请号
GB19290011592
申请日期
1929.04.15
申请人
BRITISH JEFFREY-DIAMOND LIMITED;HORACE TINSLEY
发明人
分类号
E21C29/22
主分类号
E21C29/22
代理机构
代理人
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