A nut includes an extended flange and a center hole. The cash drawer body includes a drawer accommodating portion, a front opening portion, a top surface member including a top surface section, and a front surface member including a front frame section. The at least one heater lamp of the plurality of heater lamps has a power consumption which is smaller than that of the other heater lamps. At positions where the speed starts to change or the speed change becomes small, the position determination is performed and the bandwidth is appropriately switched. The method and apparatus includes a combination of heat exchangers and devolatilizers used in conjunction with a copolymerization reactor system. The system includes an audio device, a transparent display, and a mobile device in communication with the audio device and the transparent display.