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发明名称
CIRCULAR SEAL
摘要
申请公布号
GB2140879(A)
申请公布日期
1984.12.05
申请号
GB19840004674
申请日期
1984.02.22
申请人
* HUGHES TOOL COMPANY
发明人
JAY W * JACKSON;RUBEN E * GOLDEN
分类号
E21B33/12;E21B33/128;F16J15/16;F16J15/20;(IPC1-7):F16J15/06
主分类号
E21B33/12
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代理人
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