Portable teaching aid
FIG. 1 is a front perspective view of a portable teaching aid showing my new design in operating open or expanded position;
FIG. 2 is a side elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a view in elevation of the opposite side of FIG. 1; and
FIG. 5 is a perspective view of the teaching aid in closed position.
International Classification: D1907;