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发明名称
Multistage valve
摘要
申请公布号
US2077326(A)
申请公布日期
1937.04.13
申请号
US19320609130
申请日期
1932.05.04
申请人
PAUL KAPTEYN
发明人
KAPTEYN PAUL
分类号
H01J21/20
主分类号
H01J21/20
代理机构
代理人
主权项
地址
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