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发明名称
DRILL BIT
摘要
申请公布号
RO94619(B1)
申请公布日期
1988.08.31
申请号
RO19860122464
申请日期
1986.03.06
申请人
INTREPRINDEREA "1 MAI" PLOIESTI
发明人
GRIGORESCU GABRIEL;ENE DUMITRU
分类号
E21B10/22
主分类号
E21B10/22
代理机构
代理人
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地址
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