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Mejoras introducidas en el objeto de la patente principal número 163756 caracterizadas porque las cajas están construidas teniendo como estructura anillos o cerchas unidos entre sí en sus partes inferiores por longinas destinadas a resistir los esfuerzos que tienen lugar al utilizar el carruaje y a soportar los elementos auxiliares del mismo.
ES0165697A1944-04-251944-04-25Mejoras introducidas en el objeto de la patente principal
ExpiredES165697A2
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