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发明名称
RINGROMSVENTIL
摘要
申请公布号
NO169913(C)
申请公布日期
1992.08.19
申请号
NO19840005058
申请日期
1984.12.17
申请人
HYDRIL CO
发明人
HYNES JOSEPH H;BURTON JAMES A
分类号
E21B;E21B33/06;(IPC1-7):E21B33/06
主分类号
E21B
代理机构
代理人
主权项
地址
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