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The ornamental design for a hand pump, as shown and described.
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FIG. 1 is a front perspective view of a hand pump showing my new design;
FIG. 2 is a right side elevational view;
FIG. 3 is a top plan view;
FIG. 4 is a front elevational view;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view; and,
FIG. 7 is a rear elevational view.
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