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发明名称
Electro-magnetic device
摘要
申请公布号
US2901210(A)
申请公布日期
1959.08.25
申请号
US19530364596
申请日期
1953.06.29
申请人
PHILLIPS PETROLEUM COMPANY
发明人
HEBARD GLEN G.
分类号
E21B34/06;E21B43/12;F16K31/06
主分类号
E21B34/06
代理机构
代理人
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