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发明名称
Dispositif de régulation des niveaux téléphoniques
摘要
申请公布号
FR53753(E)
申请公布日期
1946.09.06
申请号
FRD53753
申请日期
1944.09.06
申请人
SOCIETE FRANCAISE RADIO-ELECTRIQUE
发明人
分类号
H03G3/22;H04B3/06
主分类号
H03G3/22
代理机构
代理人
主权项
地址
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