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发明名称
Installation téléphonique permettant la conversation dans les deux sens entre deuxendroits
摘要
申请公布号
FR865496(A)
申请公布日期
1941.05.24
申请号
FRD865496
申请日期
1940.05.08
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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