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经营范围
发明名称
Vacuum analyzer
摘要
申请公布号
US2499288(A)
申请公布日期
1950.02.28
申请号
US19470758509
申请日期
1947.07.02
申请人
BACKUS JOHN G
发明人
BACKUS JOHN G.
分类号
H01J49/30
主分类号
H01J49/30
代理机构
代理人
主权项
地址
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