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发明名称
OILFIELD CLOSING DEVICE OPERATING SYSTEM
摘要
申请公布号
EP0192704(B1)
申请公布日期
1989.04.26
申请号
EP19850904368
申请日期
1985.08.23
申请人
HYDRIL COMPANY
发明人
WHITEMAN, JACK
分类号
E21B33/14;E21B33/06;F15B15/19
主分类号
E21B33/14
代理机构
代理人
主权项
地址
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