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Una puerta prefabricada, caracterizada por llevar interiormente montado un entramado de madera, formado por un trozo de madera provisto de una serie de cortes longitudinales entrantes y salientes, que dejan sobre el centro y los extremos del mismo unos nervios rectangulares, que constituyen la unión del entramado entre sí, formando un solo cuerpo con dos piezas simétricas de forma alargada provista de sendos rebajes longitudinales.