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经营范围
发明名称
Manufacture of hot cathodes for electric discharge devices
摘要
申请公布号
US1902478(A)
申请公布日期
1933.03.21
申请号
US19320592450
申请日期
1932.02.11
申请人
GENERAL ELECTRIC COMPANY
发明人
WIEGAND ERICH
分类号
H01J9/04
主分类号
H01J9/04
代理机构
代理人
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地址
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