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The ornamental design for a one handed computer keyboard, as shown and described.
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FIG. 1 is a top plan view of the one handed computer keyboard depicting a left handed version of the keyboard wherein the phantom lines represent solely the environmental structure and form no part of the claimed design;
FIG. 2 represents the top plan view thereof with the details and indicia on the individual keys removed therefrom; and,
FIG. 3 is a top plan view of a second embodiment thereof depicting a right-handed version of the keyboard.
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