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发明名称
Groupe d'extension mobile pour les industries d'extraction
摘要
申请公布号
FR1522930(A)
申请公布日期
1968.04.26
申请号
FR19670106451
申请日期
1967.05.16
申请人
发明人
GROETSCHEL KARL M.
分类号
E21D15/54
主分类号
E21D15/54
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代理人
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