FIG. 1 is a perspective view of a first embodiment of a keyboard showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged partial view of portion 8 of FIG. 1;
FIG. 9 is a perspective view of a second embodiment of the keyboard showing my new design;
FIG. 10 is a front elevational view thereof;
FIG. 11 is a rear elevational view thereof;
FIG. 12 is a left side elevational view thereof;
FIG. 13 is a right side elevational view thereof;
FIG. 14 is a top plan view thereof;
FIG. 15 is a bottom plan view thereof;
FIG. 16 is an enlarged partial view of portion 16 of FIG. 9;
FIG. 17 is a perspective view of a third embodiment of the keyboard showing my new design;
FIG. 18 is a front elevational view thereof;
FIG. 19 is a rear elevational view thereof;
FIG. 20 is a left side elevational view thereof;
FIG. 21 is a right side elevational view thereof;
FIG. 22 is a top plan view thereof;
FIG. 23 is a bottom plan view thereof;
FIG. 24 is an enlarged partial view of portion 24 of FIG. 17;
FIG. 25 is a perspective view of a fourth embodiment of the keyboard showing my new design;
FIG: 26 is a front elevational view thereof;
FIG. 27 is a rear elevational view thereof;
FIG. 28 is a left side elevational view thereof;
FIG. 29 is a right side elevational view thereof;
FIG. 30 is a top plan view thereof;
FIG. 31 is a bottom plan view thereof; and,
FIG. 32 is an enlarged partial view of portion 32 of FIG. 25.
The broken lines in the drawings depict portions of the keyboard that form no part of the claimed design.