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Relevador electro-magnético, del tipo de armadura oscilante sobre eje situado perpendicularmente respecto al eje de la bobina del, electroimán, caracterizado porque el referido eje de oscilación es susceptible de desplazarse paralelamente a si mismo para asegurar a la armadura una posición de reposo que responda a cualquier intensidad de la corriente de excitación.
Perfeccionamientos introducidos en un sistema de bomba con motor vibrante bajo la influencia de una corriente alterna, para permitir un funcionamiento con corriente continua