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Aro, recogedor de aceite para pistón, de los del tipo enterizos obtenidos por fundición o a partir de tubo o de los de lámina, caracterizado esencialmente por que los lomos del aro, operativos para el roce con el pistón y únicamente en dicha superficie rozante se practica un cromado, el cual no afecta a la superficie restante del aro.
Procedimiento para la recuperacion de mercurio y de sus compuestos volatiles, a partir de hollines y residuos indus-triales, por destilacion con arrastre de vapor.