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发明名称
Improvements in and relating to pit props
摘要
申请公布号
GB904034(A)
申请公布日期
1962.08.22
申请号
GB19580042014
申请日期
1958.12.30
申请人
KARL MARIA GROETSCHEL
发明人
分类号
E21D15/30;E21D15/58
主分类号
E21D15/30
代理机构
代理人
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