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Una pantalla, esencialmente constituida por una lámina circular flexible y translúcida, sujeta por su parte central entre dos cápsulas en forma de pirámide truncada, de caras cóncavas y aristas redondeadas, unidas entre sí por un vástago roscado que las atraviesa y que queda retenido por un cabezal dispuesto en su extremo exterior y por una pieza circular, roscada, a manera de tuerca, provista de dos aletas laterales en las que se fijan los extremos de dos alambres acerados que forman la pieza de sujeción a la bombilla.