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Valla desmontable perfeccionada, del tipo prefabricada, para cerramientos de obras y similares, caracterizados por el hecho de que, con el fin de poder incorporar a las mismas paneles de superficies lisas para que ostenten motivos publicitarios y/o decorativos, se disponen medios de calzo o suplemento entre los costados delgados de dichos paneles, introducidos en las gargantas de los pilares, siendo tales medios elementos de expansión como conjuntos de tornillo tuerca muelles, de l mina o helicoidales o elementos convencionales análogos.