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发明名称
HYDROSTATIC REFERENCED SAFETY-CIRCULATING VALVE
摘要
申请公布号
SG29793(G)
申请公布日期
1993.05.21
申请号
SG19930000297
申请日期
1993.03.18
申请人
HALLIBURTON COMPANY
发明人
分类号
E21B34/00;E21B34/10;E21B49/00;(IPC1-7):E21B34/10
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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