FIG. 1 is a perspective view of a first embodiment of the invention;
FIG. 2 is a front elevational view thereof, the rear elevational view being identical;
FIG. 3 is a side elevational view thereof, the opposite side elevational view being identical;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a perspective view of a second embodiment of the invention;
FIG. 7 is a front elevational view thereof, the rear elevational view being identical;
FIG. 8 is a side elevational view thereof, the opposite side elevational view being identical;
FIG. 9 is a top plan view thereof;
FIG. 10 is a bottom plan view thereof;
FIG. 11 is a perspective view of a third embodiment of the invention;
FIG. 12 is a front elevational view thereof, the rear elevational view being identical;
FIG. 13 is a side elevational view thereof, the opposite side elevational view being identical;
FIG. 14 is a top plan view thereof;
FIG. 15 is a bottom plan view thereof;
FIG. 16 is a perspective view of a forth embodiment of the invention;
FIG. 17 is a front elevational view thereof, the rear elevational view being identical;
FIG. 18 is a side elevational view thereof, the opposite side elevational view being identical;
FIG. 19 is a top plan view thereof; and,
FIG. 20 is a bottom plan view thereof.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.