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发明名称
UNIDADE DE VEDACAO ANULAR E INSERCAO
摘要
申请公布号
BR8406796(A)
申请公布日期
1985.03.19
申请号
BR1984PI06796
申请日期
1984.04.06
申请人
HYDRIL COMPANY
发明人
JOSEPH H. HYNES;JAMES A. BURTON
分类号
E21B33/06;(IPC1-7):E21B33/06
主分类号
E21B33/06
代理机构
代理人
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