ES202970A1 - Nuevo conmutador de mando automático de llamada con cumbador y luminosa para una estación de mando de un aparato intercomunicador
- Google Patents
Nuevo conmutador de mando automático de llamada con cumbador y luminosa para una estación de mando de un aparato intercomunicador
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ES202970A1952-09-131952-09-13Nuevo conmutador de mando automático de llamada con cumbador y luminosa para una estación de mando de un aparato intercomunicador
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