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Instructional toy for arithmetic operations that is formed by an armature or chassis formed by a base from which two stringers project vertically, which in turn receive an upper crossbar forming a frame in which it is suspended, freely rotating on axes, pieces with preferably geometric signs in different colors, the upper signs corresponding to the arithmetic operations and the lower signs of the same color as the upper ones to the result of the same. (Machine-translation by Google Translate, not legally binding)
ES115034U1965-07-241965-07-24
INSTRUCTIONAL TOY OF ARITHMETIC OPERATIONS.
ExpiredES115034Y
(en)