The invention relates to an industrial furnace for melting and gas-treating nonferrous metals. The radiation detector includes plural pixels that generate electrical charges upon irradiation with radiation and that accumulate the electrical charges. Furthermore, the shower drainage outlet is designed to be inserted through an opening in the floor region of the aircraft. The telephone number has associated telephone connectivity via a telephone line, such that the Integrated Devices can be connected to by dialing the associated telephone number via telephones on the PSTN. The apparatus of this structure eliminates phase interferences between a center speaker and right and left speakers by controlling sound waves generated by the center speaker, thereby achieving excellent reproduction of music. The guide portion is provided more on an upstream side in the first rotation direction than the facing position, and guides the developer from the storing portion to the developing roller side.