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发明名称
SAFETY VALVES FOR WELLS
摘要
{PG,1
申请公布号
US3860066(A)
申请公布日期
1975.01.14
申请号
US19720301525
申请日期
1972.10.27
申请人
OTIS ENGINEERING CORPORATION
发明人
PEARCE, JOSEPH L.;SIZER, PHILLIP S.;TAYLOR, DONALD F.
分类号
E21B34/00;E21B34/08;E21B34/10;(IPC1-7):E21B33/03;E21B43/12
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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