US D306859 S
FIG. 1 is a front, top and right side perspective view of an add-on module for a homogeneous unit telephone set showing our new design;
FIG. 2 is a bottom plan view;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a front elevational view thereof; and
FIGS. 6 and 7 are respectively left and right side elevational views thereof.