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摘要
申请公布号
US3005174(A)
申请公布日期
1961.10.17
申请号
US19570659330
申请日期
1957.05.15
申请人
SYLVANIA ELECTRIC PRODUCTS INC.
发明人
PIFER MARION J.
分类号
H01J5/12;H01J19/66
主分类号
H01J5/12
代理机构
代理人
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