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发明名称
Dispositif changeur de fréquence à lampe bigrille et hétérodyne séparée
摘要
申请公布号
FR676295(A)
申请公布日期
1930.02.20
申请号
FRD676295
申请日期
1929.06.06
申请人
发明人
DEFRANCE HENRI
分类号
H03D7/10
主分类号
H03D7/10
代理机构
代理人
主权项
地址
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