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发明名称
Improved extension shoe for a pit-prop
摘要
申请公布号
GB882801(A)
申请公布日期
1961.11.22
申请号
GB19580022210
申请日期
1958.07.10
申请人
BECORIT GRUBENAUSBAU G.M.B.H.
发明人
分类号
E21D15/52
主分类号
E21D15/52
代理机构
代理人
主权项
地址
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