In a contactless IC card, a rectification circuit rectifies an electromagnetic wave received via an antenna to provide a DC voltage, and an electric double-layer capacitor quickly stores the power from the rectification circuit. The hearing aid part comprises, a control unit and an antenna circuit that are part of a wireless unit for wireless transmission andor reception of electromagnetic signals. The restrictions exerts a choking for maintaining pressure in a steam system when the valve is used as a steam trap. Memory systems are described which include circuitry for driving bit lines, word lines and drive lines to accomplish both the write and read operations.