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发明名称
DISPOSITIVO PARA VEDACAO DE UMA FOLGA ANULAR NUM POCO
摘要
申请公布号
BR9004057(A)
申请公布日期
1991.09.03
申请号
BR19909004057
申请日期
1990.08.16
申请人
VETCO GRAY INC.
发明人
JOHN E. NELSON
分类号
E21B33/00;E21B33/043;(IPC1-7):F16J15/02
主分类号
E21B33/00
代理机构
代理人
主权项
地址
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