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发明名称
CONJUNTO PARA FECHAMENTO DE FURO DE ESCAVACAO, PARA USO EM UM PRODUTO OU POCO ATIVO DE GAS
摘要
申请公布号
BR7906664(A)
申请公布日期
1980.06.03
申请号
BR19790006664
申请日期
1979.10.16
申请人
DRAVO CORP
发明人
HAMILTON W
分类号
E21B33/04;(IPC1-7):E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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