The ornamental design for a dimmerswitch, as shown and described.
FIG. 1 is a front perspective view of a dimmer switch showing a first embodiment of our new design.
FIG. 2 is a front elevation view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a bottom view thereof.
FIG. 6 is a top view thereof.
FIG. 7 is a front perspective view of a dimmer switch according to a second embodiment of the design shown in FIG. 1.
FIG. 8 is a front elevation view thereof.
FIG. 9 is a left side view thereof.
FIG. 10 is a right side view thereof.
FIG. 11 is a bottom view thereof; and,
FIG. 12 is a top view thereof.
The rear views form no part of the design and are omitted. The portions of the drawings appearing in broken line are for environment only and do not form a part of the design.