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"CIRCULAR ARITHMETIC TABLE", which is characterized by being constituted by two equal discs superimposed, joined by an axis that allows the independent rotation of the same, whose lower disc has printed six rows of numbers, in all the extension of six rings, circular , divided into nine sectors, these numbers corresponding the results corresponding to the adding operations in the third and fifth and multiplying in the fourth and sixth rings; and a fixed factor of the sum, in the first ring and the multiplication in the second ring; carrying the upper disc; marked two circular sectors of the same measure as those of the lower disk; these two sectors being perforated, each by three windows, so that they allow to see a fixed factor and the results of the sum, in one of the sectors; and the same fixed factor and the results of the multiplication, in the other sector. (Machine-translation by Google Translate, not legally binding)
System of superimposed discs comprising the tables of adding, subtracting, multiplying and dividing. (Machine-translation by Google Translate, not legally binding)
Improved system of superimposed discs comprising the addition, subtraction, multiplication and division tables, for school use. (Machine-translation by Google Translate, not legally binding)