Abstract: A cloth retention strip is folded to have two plies. The retention strip is sewn onto an oval shaped cloth panel along a border thereof. A draw string is retained between the plies. The draw string is operable to draw the panel over the toe and around the heel of a shoe that is worn by a user. The draw string may be held in place by fastening two cloth tabs on the draw string to each other or to a third fastener on the shoe covering. A non-skid material may be sewn, baked, or deposited onto the outside surface to provide a non-skid surface.

Abstract: A device and method are set forth for electro-stimulation. The user can select an overall treatment protocol of current frequencies and amplitudes to be applied for specified dwell periods defining a sweep cycle. The user can select for one or more periods in the cycle a frequency/amplitude to be applied to elicit a response such as a muscle contraction or the like. The device protocols may be selected to elicit responses while conserving power, to provide for heating without eliciting a response or to hop between frequency/amplitude combinations to produce the desired effect.

Abstract: A device and method are set forth for crushing rocks. The device includes first and second rotors defining therebetween a nip for crushing rocks. A feed opening is provided to feed rock between the rotors to the nip. Angular shoes on the second rotor direct rocks between the openings. In a further aspect, the second rotor may have a non-circular perimeter such as a pentagon or the like.