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发明名称
Perfectionnements apportés aux dispositifs dits <<boulons de soutenement>>, notamment pour les toits de mines
摘要
申请公布号
FR1293618(A)
申请公布日期
1962.05.18
申请号
FR19610857899
申请日期
1961.04.06
申请人
发明人
PIERRARD JEAN
分类号
E21D21/00
主分类号
E21D21/00
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代理人
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