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发明名称
Dispositif de récupération des couronnes de forage des forets de perçage des roches et dispositifs analogues
摘要
申请公布号
FR993334(A)
申请公布日期
1951.10.30
申请号
FRD993334
申请日期
1949.08.16
申请人
发明人
ROLLES RUDI
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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