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发明名称
Steel pit-prop
摘要
申请公布号
GB378736(A)
申请公布日期
1932.08.18
申请号
GB19310033774
申请日期
1931.12.05
申请人
DUGALD BAIRD;DAVID CHALMERS GEMMELL;THE WEMYSS COAL COMPANY LIMITED
发明人
分类号
E21D15/54
主分类号
E21D15/54
代理机构
代理人
主权项
地址
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