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Individual
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Individual
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Application filed by IndividualfiledCriticalIndividual
Priority to ES0045588UpriorityCriticalpatent/ES45588Y/en
Publication of ES45588UpublicationCriticalpatent/ES45588U/en
Application grantedgrantedCritical
Publication of ES45588YpublicationCriticalpatent/ES45588Y/en
Improved blackboard, characterized in that the rectangular plane that forms the wax or slate itself, has horizontal slots equally spaced from each other, in which signs, letters or numbers are introduced, these are arranged forming at its base two right angles, of which the minor protrudes from the plane of the blackboard and the largest fits into the slot of said plane. (Machine-translation by Google Translate, not legally binding)