US D328458 S
FIG. 1 is a top front and side perspective view of a trackball for computer system showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view thereof; and,
FIGS. 6 and 7 are, respectively, right and left side elevational views thereof.