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Priority to ES1968135230UpriorityCriticalpatent/ES135230Y/en
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Publication of ES135230YpublicationCriticalpatent/ES135230Y/en
Didactic device, of the type composed of an abacus characterized in that it essentially comprises, in association with the abacus, a panel provided with rotating discs operable by a control button to which disks are faced windows that allow the view of the data recorded in the latter, being equipped with the upper edge of the panel with a movable indicator element, combined with a central clock with rotating needles. (Machine-translation by Google Translate, not legally binding)