A DC-to-AC power inverter includes an input port, an output port, a switching circuit, and a system controller. The article identifying system 1 comprises a communication tag 100, each of which is attached to an article, and an information output device 200. The resettable integrator determines the at least one harmonic coefficient over a single signal period and is then reset. The frame forms a front face of the treatment container and is connected to the container casing in an interlocking manner. A U-shaped region is formed between the two device regions. Control unit 100 sets the target shifting required time based on parameters indicative of the state of engine 1 or the transmission, and corrects the command value to the friction clutch so that the required shift time can approach the above target shift required time.