An axle tube structure for a motor includes a casing having an axle tube. An RFID system includes RFID tags and a transmission line. The sensors sense myoelectric potentials of the muscles at a time of the work. The component object interface receives input from the external monitor and communicates the input to the controller. The struts can be curved members with convex curvature. The bills are folded based on denomination to allow the customer receiving the bills from the cash dispenser to be able to identify the denomination of each bill.