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经营范围
发明名称
électrodes d'excitation
摘要
申请公布号
FR845687(A)
申请公布日期
1939.08.30
申请号
FRD845687
申请日期
1938.11.07
申请人
WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY
发明人
分类号
H01J13/38
主分类号
H01J13/38
代理机构
代理人
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