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The ornamental design for a knee keyboard, as shown and described.
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FIG. 1 is a top, left, perspective view of the knee keyboard;
FIG. 2 is a Rear elevation;
FIG. 3 is a Left End elevation;
FIG. 4 is a Right End elevation; and,
FIG. 5 is a Bottom Plan.
Crawford, Arthur DeWayne, Crawford, Lisa Anita
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