Abstract: A badge holder for holding a badge includes a front piece and a back piece opposite the front piece. The back piece is coupled to the front piece to provide a holding slot for the badge. A first ejector has a proximal end and a distal end. The proximal end is rotatably coupled to at least one of the front piece and the back piece. The first ejector is configured to rotate such that the distal end forces at least a portion of the badge out of the holding slot.

Abstract: A propulsion system for a manually-operated mobility device includes a hand rim configured to receive a propulsion force from a user of the manually-operated mobility device, a wheel hub fixedly attached to a wheel for the manually-operated mobility device, and a planetary gear system including a sun gear, a ring gear, and one or more planetary gears disposed between the sun gear and the ring gear. The one or more planetary gears are supported by a planet carrier. One of the sun gear and the ring gear is fixedly coupled to the hand rim and the other of the sun gear and the ring gear is fixedly coupled to the wheel hub.