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发明名称
FERRAMENTA PARA FURO DE POCO COM ACOPLAMENTO POR EFEITO DE HALL
摘要
申请公布号
BR8905977(A)
申请公布日期
1990.06.19
申请号
BR19890005977
申请日期
1989.11.28
申请人
HUGHES TOOL COMPANY
发明人
MIG A. HOWARD
分类号
E21B12/02;E21B17/02;E21B47/01;E21B47/12;(IPC1-7):E21B49/00
主分类号
E21B12/02
代理机构
代理人
主权项
地址
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