An old time tool that's crude but effective. Its handle incorporates a sliding weight like the one on a dent puller.
Set the jaws on either side of a nail head and smack the weight against it. Impact forces the pointed jaws to dig in
around the nailhead and pinch it tight. Rock the tool back onto the jaw's extended foot, and lever the nail out.
Leaves a bit of a mark, but by golly it gets the job done.
