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发明名称
MANDRIN D'ENTRAINEMENT D'UNE TIGE DE FORAGE
摘要
申请公布号
BE869971(A1)
申请公布日期
1978.12.18
申请号
BE19780190067
申请日期
1978.08.25
申请人
DIAMANT BOART
发明人
分类号
B23B31/173;E21B3/02;(IPC1-7):B23B/
主分类号
B23B31/173
代理机构
代理人
主权项
地址
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