Unidecimal-based Abacus

The patent or application file contains a least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 is a front isometric view of the unidecimal-based abacus, showing my new design;

FIG. 2 is a rear isometric view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is rear elevation view thereof;

FIG. 5 is an enlarged side plan view thereof; and,

FIG. 6 is a top plan view.

The portion, if any, of the unidecimal-based abacus depicted in the figures in broken lines forms no part of the claimed design.