A voltage conversion circuit for converting the voltage of an input signal to the voltage of an output signal is provided. Also, the diffusion region is boron-doped at a concentration of 11020cm3 to 11021cm3. Thereby the liquid cooling devices can simultaneously and independently be supplied with rolling stock to be hardened. Thus sheet glass may be manufactured to different width specifications with the same forming block. An orthogonal instruction set makes possible any operation on any register using any addressing mode.