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Puerta guillotina, que se caracteriza por estar constituida por dos hojas verticales, que en el cierre se acoplan a tope por sus bordes contiguos; lateralmente disponen de unas roldanas encarriladas en las correspondientes guías, estando relacionadas ambas hojas por cables o similares que discurren en sendas poleas fijadas, a la estructura superior de la puerta, de modo, que al, desplazar verticalmente una, de ellas es consigue idéntico desplazamiento de la otra en sentido opuesto, quedando retenidas ambas en cualquier posición intermedia a causa del equilibrado de sus pesos.