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发明名称
RETRIEVABLE WELL SAFETY VALVE WITH EXPANDABLE EXTERNAL SEALS
摘要
申请公布号
GB2190941(A)
申请公布日期
1987.12.02
申请号
GB19860030141
申请日期
1986.12.17
申请人
* CAMCO INCORPORATED
发明人
RONALD EARL * PRINGLE
分类号
E21B34/10;(IPC1-7):E21B34/06;E21B23/02
主分类号
E21B34/10
代理机构
代理人
主权项
地址
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