Rotary calculator for legal fees - has circular disc each side of fixed centre disc and triangular cut=outs to show calculated amounts

摘要

The calculator is a central fixed disc. On each side is another circular disc, which can rotate relative to the central disc. Triangular cutouts or windows are provided to show three different classes of fees: the total amount, in black; the percentage in red and the amount for the notary's fees, in blue. Two basic categories are covered : current acts such as selling contracts and hereditary acts, such as wills. One disc covers one only of these two classes and the relevant face of the central disc has the corresponding information printed on it.