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发明名称
Two-zone pump
摘要
申请公布号
US2522825(A)
申请公布日期
1950.09.19
申请号
US19460707653
申请日期
1946.11.04
申请人
OTIS PRESSURE CONTROL, INC.
发明人
HOFFER TEMPLE P.
分类号
E21B23/02
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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