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发明名称
WELL INJECTION VALVE WITH RETRACTABLE CHOKE
摘要
申请公布号
GB2172319(B)
申请公布日期
1988.01.20
申请号
GB19860003064
申请日期
1986.02.07
申请人
* CAMCO INCORPORATED
发明人
RONALD EARL * PRINGLE
分类号
E21B34/08;E21B34/10;(IPC1-7):E21B34/06
主分类号
E21B34/08
代理机构
代理人
主权项
地址
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