Linear abacus

Description

FIG. 1 is a top view of the linear abacus showing our new design;

FIG. 2 is a perspective view thereof; and,

FIG. 3 is a bottom view thereof.

The broken lines in the drawings depict portions of the linear abacus that form no part of the claimed design. The drawings include a symbolic break in length of the article, represented by a pair of adjacent parallel break lines, drawn with broken lines. The appearance of any portion of the article between the break lines forms no part of the claimed design.

Claims

The ornamental design for a linear abacus, as shown and described.