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经营范围
发明名称
Polished rod insulation
摘要
申请公布号
US2574550(A)
申请公布日期
1951.11.13
申请号
US19490126498
申请日期
1949.11.10
申请人
THE TEXAS COMPANY
发明人
EDWARDS WILLIAM H.
分类号
F04B53/14
主分类号
F04B53/14
代理机构
代理人
主权项
地址
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