Auto erasable blackboard for children's applications (Machine-translation by Google Translate, not legally binding)

摘要

Screw aut0b0rrable for children uses characterized by comprising a hollow box exterior housing advantageously low height consisting of several pieces joined together said box located inside a powdery colored material which through a plurality of balls of small size freely housed in that box is susceptible to adhering such pulverulent material in the corresponding inner face of a transparent plate such as a crystal that for that purpose constitutes total and in its case partially one of the larger faces of said box with the particularity that inside said box there is in turn a mobile body operable at will from the outside able to act as a writing organ to whose object such mobile body makes contact with the aforementioned inner face of the transparent plate to determine in its travel the detachment of that pulverulent material adhered in the repetitive inner side of the transparent plate. (Machine-translation by Google Translate, not legally binding)