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发明名称
BLOWOUT PREVENTER VALVE APPARATUS
摘要
申请公布号
GB8414782(D0)
申请公布日期
1984.07.11
申请号
GB19840014782
申请日期
1983.10.12
申请人
HYDRIL CO
发明人
分类号
E21B33/06;E21B21/10;E21B23/02;E21B34/08;(IPC1-7):E21B23/02
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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