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ES104737A1927-10-191927-10-19Instalación para la desconexión de aparatos roentgen al alcanzar un grado inadmisible la intensidad de la corriente.
ExpiredES104737A2
(es)
Dispositivo para el influenciamiento automático de la corriente de energía entre dos redes de corriente alterna de frecuencia distinta acopladas entre ellos.