An electric motor assembly including an electric motor and a flywheel assembly. The inventive blade is manufactured using a stamping die comprising an upper mold portion including a knockout, a lower mold portion including a punch and movable relative to the upper mold portion. The first DMA server communicates with the first mobile communication device via a first wireless communication protocol. OSD control micro-computer 3 determines the sort of the font in use and size of the font based on a display language request signal from the user and the sort of graphics display standard of the input signal. The LED chip 4 is die-bonded to an inner bottom surface of the cup portion 8 with the n-electrode 4d or the p-electrode 4e oriented downward whereas the p-electrode 4e or the n-electrode 4d oriented upward.