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发明名称
FAILSAFE GAS CLOSED SAFETY VALVE
摘要
申请公布号
GB2183695(B)
申请公布日期
1989.10.11
申请号
GB19860027858
申请日期
1986.11.21
申请人
* CAMCO INCORPORATED
发明人
WILLIAM ALLEN * BLIZZARD
分类号
E21B34/00;E21B34/10
主分类号
E21B34/00
代理机构
代理人
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地址
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