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发明名称
Procédé et dispositif de signalisation
摘要
申请公布号
FR998330(A)
申请公布日期
1952.01.17
申请号
FRD998330
申请日期
1949.10.28
申请人
STAATSBEDRIJF DER POSTERIJEN, TELEGRAFIE EN TELEFONIE
发明人
OBERMAN ROELOF MAARTEN MARIE;SNIJDERS ANTONIE
分类号
H04M1/23;H04M1/515;H04Q1/38
主分类号
H04M1/23
代理机构
代理人
主权项
地址
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