US D442559 S1
FIG. 1 is a perspective view of front pieces of control and regulation electronic instruments and relevant regulation knobs showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a right side view.