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发明名称
Improvements relating to bars for supporting the roof in mines and for like purposes
摘要
申请公布号
GB804470(A)
申请公布日期
1958.11.19
申请号
GB19550029871
申请日期
1955.10.19
申请人
HUGH WOOD AND COMPANY LIMITED
发明人
WALTON JOHN THOMAS
分类号
E21D17/086
主分类号
E21D17/086
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代理人
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