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发明名称
Appareil de sécurité pour prélèvement de carottes dans un trou
摘要
申请公布号
FR1258851(A)
申请公布日期
1961.04.21
申请号
FR19600818459
申请日期
1960.02.15
申请人
ELECTRICITE DE FRANCE
发明人
分类号
E21B49/06
主分类号
E21B49/06
代理机构
代理人
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