The ornamental design for a stenographykeyboard, as shown and described.
FIG. 1 is a front perspective view of a stenography keyboard;
FIG. 2 is a top view of the stenography keyboard;
FIG. 3 is a bottom view of the stenography keyboard;
FIG. 4 is a left-side view of the stenography keyboard;
FIG. 5 is a right-side view of the stenography keyboard;
FIG. 6 is a front-side view of the stenography keyboard; and,
FIG. 7 is a rear-side view of the stenography keyboard.
Broken lines in the drawings depict portions of the stenography keyboard that form no part of the claimed design. The claim is directed to the design shown in solid line and shaded surfaces and all unshaded surfaces shown between the broken and solid lines form no part of the claimed design.