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发明名称
Improvements relating to hydraulic pit props
摘要
申请公布号
GB904795(A)
申请公布日期
1962.08.29
申请号
GB19590030643
申请日期
1959.09.08
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
FRYE COLIN MICHAEL
分类号
E21D15/44
主分类号
E21D15/44
代理机构
代理人
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