Keyboard

FIG. 1 is a perspective view of a keyboard showing the new design; FIG. 2 is another perspective view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a back elevation view thereof; FIG. 5 is an enlarged left-side view thereof; FIG. 6 is an enlarged right-side view thereof; FIG. 7 is a top plan view thereof; and FIG. 8 is a bottom plan view thereof. FIG. 9 is an enlarged view of the encircled portion ‘ 9 ’ in FIG. 1 . FIG. 10 is an enlarged view of the encircled portion ‘ 10 ’ in FIG. 1 . FIG. 11 is an enlarged view of the encircled portion ‘ 11 ’ in FIG. 1 ; and, FIG. 12 is an enlarged view of the encircled portion ‘ 12 ’ in FIG. 2 . The equal-length broken lines depict portions of the keyboard that form no part of the claimed design. The dash-dot broken lines in the drawings represent the extents of the enlarged detail views and form no part of the claimed design.