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发明名称
Improvements relating to supports for horse-heads and the like in coal mines
摘要
申请公布号
GB711629(A)
申请公布日期
1954.07.07
申请号
GB19510026805
申请日期
1951.11.15
申请人
ABRAM YEUDALL
发明人
分类号
E21D17/03
主分类号
E21D17/03
代理机构
代理人
主权项
地址
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