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发明名称
Dispositif servant à produire un faisceau électronique de section constante
摘要
申请公布号
FR1005789(A)
申请公布日期
1952.04.15
申请号
FRD1005789
申请日期
1947.09.24
申请人
DIRECTEUR DU CENTRE NATIONAL D'ETUDES DES TELECOMMUNICATIONS
发明人
分类号
H01J23/027
主分类号
H01J23/027
代理机构
代理人
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地址
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