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发明名称
Improvements in telescopic pit props
摘要
申请公布号
GB813276(A)
申请公布日期
1959.05.13
申请号
GB19560021737
申请日期
1956.07.13
申请人
EWALD WILHELM WIEMANN
发明人
分类号
E21D15/00;E21D15/38;E21D15/54;E21D15/60
主分类号
E21D15/00
代理机构
代理人
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