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经营范围
发明名称
A FLUID OPERATED ACTUATOR
摘要
申请公布号
GB2234014(A)
申请公布日期
1991.01.23
申请号
GB19890016744
申请日期
1989.07.21
申请人
* NATIONAL OILWELL
发明人
R* HART
分类号
E21B33/035;E21B34/04;E21B34/16;F16K31/122
主分类号
E21B33/035
代理机构
代理人
主权项
地址
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