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经营范围
发明名称
Fluid pressure operated chemical feeder
摘要
申请公布号
US2968351(A)
申请公布日期
1961.01.17
申请号
US19560602621
申请日期
1956.08.07
申请人
JONES EDWARD N
发明人
JONES EDWARD N.
分类号
E21B27/02
主分类号
E21B27/02
代理机构
代理人
主权项
地址
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