Ranges available at the end of the twentieth century had the same shape, size and voltage standardized in the 1960s, but heralded innovative materials. Equipped with a glass cooking surface, marked with circles to indicate the location of the elements beneath, a 2003 Whirlpool model is distinguished by the electronic control of both cooking and self-cleaning functions, built-in oven grills and utensils, an anti-tip bracket, and the specialized four-pronged plug to fit the outlet required for high voltage appliances.
