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Juguete instructivo caracterizado por comprender una placa básica de fondo que en su parte inferior presenta una ranura-guía abierta en sentido horizontal sobre la cual va establecida una tabla triangular de resultados constituida por grupos de cifras distribuidos convencionalmente habiéndose previsto por debajo de la propia ranura-guía una escala numérica que aporta las combinaciones en que está implicada la incógnita.