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Caja-envase, constituida por dos partes -cuerpo y tapa- confeccionadas configurativamente de manera similar y de modo que cada una de dichas partes se obtiene a partir de una plancha del material empleado de forma general rectangular de la que únicamente se producen como desperdicios cuatro pequeñas entallas en los cuatro ángulos de la pieza dicha, cuyo valor superficial tiene una relación muy pequeña con el valor de la superficie total utilizada.