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发明名称
APERFEICOAMENTO EM VEDACAO DE MANCAL PARA BROCAS PARA ROCHA E APERFEICOAMENTO EM FERRAMENTA PERFURADORA DE TERRA
摘要
申请公布号
BR7601088(A)
申请公布日期
1977.09.06
申请号
BR19760001088
申请日期
1976.02.20
申请人
SMITH INT INC
发明人
NEILSON W
分类号
(IPC1-7):E21B9/35
主分类号
(IPC1-7):E21B9/35
代理机构
代理人
主权项
地址
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