Handheld Folding Fan

FIG. 1 is front view of a handheld folding fan; FIG. 2 is a rear view thereof; FIG. 3 is a left view thereof; FIG. 4 is a right view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is front, right perspective view thereof; FIG. 8 is rear, left perspective view thereof; FIG. 9 is a rear, right view of FIG. 1 folded; and, FIG. 10 is a front, left view of FIG. 1 folded. The broken lines shown in the drawings depict portions of the handheld folding fan that form no part of the claimed design.