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Automobile parts are made by auto part manufacturers. Auto supplies are made by auto supply manufacturers. Some kinds of automobile parts, such as tires, are made by many different auto part manufactures while other automobile parts, such as diesel engines, are only made by a handful of manufacturers. Some automobile part manufacturers specialize in making just a handful of parts while others make dozens or even hundreds of parts. Some kinds of auto supplies are made by dozens of companies while others are made by only a handful. Some auto supply manufacturers made dozens of different products and supplies while others concentrate on just making one kind of auto supply or on a handful of different kinds of supplies. Some auto parts makers just make parts for one make of car while others make parts and supplies that can be used on many different makes of car and truck.
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