I claim the ornamental design for a keyboard, as shown and described.
FIG. 1 is a front perspective view of a keyboard; and,
FIG. 2 is a front plan view of the keyboard.
The broken lines, adjacent to the indicia on the keys, are understood to represent the bounds of the claimed and all other broken lines are shown for environmental purposes only and form no part of the claimed design.
CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE FROM RESEARCH IN MOTION LIMITED TO 2012244 ONTARIO INC PREVIOUSLY RECORDED ON REEL 024056 FRAME 0445 ASSIGNOR S HEREBY CONFIRMS THE ATTACHED ASSIGNMENT SUPPORTS THIS CORRECTION