Keyboard

U.S. Design application Ser. No. 29/538,661 filed Sep. 4, 2015 is incorporated herein in its entirety by reference thereto.

FIG. 1 is a top front perspective view of a keyboard showing the claimed design;

FIG. 2 is a bottom rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the figures show portions of the keyboard that form no part of the claimed design.