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Thermistors with positive temperature characteristics of resistance have been recently developed. Their distinguished temperature characteristics, being divided into two groups--type SW and TC--have various application fields in electronic and electrical engineering. The paper describes and surveys the processing techniques of major importance, the fundamental characteristics of this component, and design criteria for the desired component. Various uses of the component, as a thermal controller, a current limiter, a current stabilizer, a temperature compensator, etc., are explained to serve as a guide to other applications.