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Anelli elastici a basso spessore radiale in una o piu' parti,poggianti sul fondo cava del pistone o di un parafiamma,per tenute e/o raschiaolio su motori termici (o su compressori o macchine operatrici o sistemi di comando) sottoposti alle variazioni di pressione di temperatura e di diametro del cilindro durante la loro corsa