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Por un transportador y elevador bitubo helicoidal esencialmente constituido por dos cilindros tubulares o macizos de superficie helicoidal, de paso variable, dispuestos paralelamente entre cojinetes y dotados de movimiento de rotación de tal modo que ambos giren en sentidos inversos entre sí y convergentes, pudiendo lograrse este movimiento por cualquier medio mecánico ya conocido.
Un dispositivo de guía elástica entre dos elementos movibles telescópicamente uno respecto al otro con interposición de cuerpos giratorios de goma o de material similar