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The history of the Oster brand began in 1924 when Mr. John Oster saw an opportunity to market a hand-operated hair clipper. The new product was designed to cut and style women's hair. Four years later, a new motor-driven clipper was introduced, and soon, The John Oster Manufacturing Company became a manufacturer of choice for professionals in the grooming industry. In 1946, John Oster made a decision to diversify from barber equipment to small house electrical appliances and purchased Stevens Electric, the company that invented the liquefier blender in 1923. Soon after, the first Osterizer blender was introduced.

With the success of this one model, Oster Manufacturing Company began building its fine name and reputation in the small appliances industry. As time passed by, blenders became more powerful and began to perform a variety of food preparation tasks, like grating, grinding, chopping, pureeing and much more. With such appliances as breadmakers, juice extractors, mixers and toasters, the Oster brand has grown to be a symbol of quality and style in the industry. In 1960, the John Oster Manufacturing Company was acquired and became a wholly owned subsidiary of the Sunbeam Corporation.