The ornamental design for a key telephoneset, substantially as shown and described.
FIG. 1 is a front elevational view of a key telephone set showing my new
design.
FIG. 2 is a rear elevational view thereof;
FIGS. 3 and 4 are respectively top and bottom plan views thereof;
FIGS. 5 and 6 are respectively left and right side elevational views
thereof; and
FIG. 7 is a front, top and right side perspective view of the stand with
the handset removed from the cradle in the stand and inverted and spaced
to one side to show (1) the underside of the handset and (2) the cradle
surfaces.