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发明名称
Perfectionnements aux systèmes et appareils téléphoniques multiples, notamment aux postes d'intercommunication privés ou mixtes
摘要
申请公布号
FR836581(A)
申请公布日期
1939.01.20
申请号
FRD836581
申请日期
1938.04.13
申请人
发明人
TOUCHAIS PIERRE
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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