US D421021 S
FIG. 1 is a front, top and right side perspective view of a key matrix showing our new design;
FIG. 2 is a top elevational view thereof;
FIG. 3 is a front plan view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a rear plan view thereof.