Methods and apparatus for operating a secondary sense amplifier according to different timings. Information sent to or from the machines is transmitted using electronic mail or a via a direct connection. In a preferred embodiment, the adjustment circuit comprises a variable resistor disposed between an internal shield that acts as a passive anode and a target. The less power-consuming current is conducive to the reduction of capacitance required for a backup battery. In a display device which includes a display panel and a frame member which supports an outer peripheral portion of a display screen of a display panel, a water absorbing member is adhered to a surface of the frame member which faces the display panel in an opposed manner. The cemented metal carbide substrate is bonded in turn to the front end of a cemented metal carbide bolster.