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发明名称
Perfectionnements apportés aux dispositifs de signalisation pour installations téléphoniques, notamment pour celles à batterie centrale
摘要
申请公布号
FR749968(A)
申请公布日期
1933.08.02
申请号
FRD749968
申请日期
1933.02.02
申请人
ASSOCIATION DES OUVRIERS EN INSTRUMENTS DE PRECISION
发明人
分类号
G08B5/28
主分类号
G08B5/28
代理机构
代理人
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地址
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