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发明名称
Valves
摘要
申请公布号
US3398928(A)
申请公布日期
1968.08.27
申请号
US19660533667
申请日期
1966.03.11
申请人
OTIS ENGINEERING CORPORATION
发明人
FREDD JOHN V.
分类号
E21B34/00;E21B34/12;F16K5/00;F16K31/44
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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