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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.