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经营范围
发明名称
AVLEDNINGSSYSTEM.
摘要
申请公布号
NO165651(B)
申请公布日期
1990.12.03
申请号
NO19840003647
申请日期
1984.09.14
申请人
HYDRIL CO
发明人
ROCHE JOSEPH R
分类号
E21B;E21B21/08;E21B21/10;F16K11/02;(IPC1-7):E21B21/10
主分类号
E21B
代理机构
代理人
主权项
地址
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