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发明名称
EQUIPAMENTO PARA PERFURAR TODOS OS TIPOS DE SOLO PELO SISTEMA DE PERCUSSAO A CABO, ROTO-PERCUSSAO DE ALTA FREQUENCIA, ROTATIVO COM CIRCULACAO DIRETA DE AR, ROTATIVO COM CIRCULACAO DIRETA OU REVERSA DE LAMA DE PERFURACAO OU AGUA
摘要
申请公布号
BR6802730(U)
申请公布日期
1990.08.07
申请号
BR1988MU02730U
申请日期
1988.12.13
申请人
PROMINAS BRASIL S/A EQUIPAMENTOS E TECNOLOGIA
发明人
UBIRACI M. PIRES CORREA
分类号
E21B7/00;(IPC1-7):E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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