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ES42082A1907-11-271907-11-27Un sistema especial y desconocido para producir el cambio automático de los trolles de los tranvías eléctricos.
ExpiredES42082A1
(es)
Un sistema o aprovechamiento de la fuerza de contramarcha del tranvía eléctrico para producir por este medio el cambio automático del trolley de los tranvías eléctricos.