FIG. 1 is a side elevation view showing my new design for a cover installed on a plug-in device;
FIG. 2 is a back elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a side elevation view thereof removed from a plug-in device;
FIG. 7 is a front elevation view of the outside thereof removed from a plug-in device;
FIG. 8 is a front elevation view of the inside thereof removed from a plug-in device;
FIG. 9 is a bottom plan thereof removed from a plug-in device;
FIG. 10 is a top plan thereof removed from a plug-in device;
FIG. 11 is a left perspective view thereof from above and installed on a plug-in device;
FIG. 12 is a right perspective view thereof from above and installed on a plug-in device;
FIG. 13 is a left perspective view thereof from below and installed on a plug-in device;
FIG. 14 is a right perspective view thereof from below and installed on a plug-in device;
FIG. 15 is a left perspective view thereof from above and removed from a plug-in device;
FIG. 16 is a right perspective view thereof from above and removed from a plug-in device;
FIG. 17 is a left perspective view thereof from below and removed from a plug-in device; and,
FIG. 18 is a right perspective view thereof from below and removed from a plug-in device.
Broken lines in the figures are for illustrative purposes only and form no part of the claimed design.