System for obtaining luminous signals that are results of elementary arithmetic operations. (Machine-translation by Google Translate, not legally binding)

摘要

System for obtaining light signals that are the results of elementary arithmetic operations, characterized by the establishment of an electrical circuit powered by a dry battery that puts into service a battery of bulbs properly grouped and ordered, each of which has a switch attached which is put into service by a key or button that presents a certain figure or figure which, when pressed or pressed, causes the same bulb to always light up. (Machine-translation by Google Translate, not legally binding)