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ES1914A1881-09-291881-09-29Un aparato electro-impresor, sistema Mariana, para el servicio de telégrafos en sustitución del Hughes.
ExpiredES1914A1
(es)
Un procedimiento o sistema perfeccionado de distribución para aparatos elevadores de líquido, funcionando por medio de la presión directa de los gases o vapores en tensión.