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Original equipment manufacturer (OEM) is a term used when one company makes a part or subsystem that is used in another company's end product. The term is used in several ways, and the ambiguity of the term's usage can sometimes be unclear, even in context. It can alternately refer to a part or subsystems maker, the maker of a system that includes subsystems, an end product producer, or an automotive part that is manufactured by the same company that produced the original part used in assembly. Generally, an OEM is the company that makes a part that is marketed by another company typically as a component of the second company's product. For example, if Acme Manufacturing Co. makes power cords that are used on IBM computers, Acme is the OEM. Confusingly, OEM can sometimes also refer to companies like value-added resellers. In this usage if Acme Co. sells circuit boards to IBM for use in IBM mainframes, IBM is the OEM.〔(Ken Olsen: PDP-1 and PDP-8 (page 3) ), economicadventure.com〕 When referring to auto parts, OEM refers to parts and manufacturers involved in the final assembly of a vehicle—in contrast to aftermarket parts that can be installed after the car comes out of the factory. For example, if Ford used Autolite spark plugs, Exide batteries, Bosch fuel injectors, and Ford's own engine blocks and heads when building a car, then car restorers and collectors consider all of those brands as OEM brands, in contrast to aftermarket brands (such as Champion plugs, DieHard batteries, Kinsler fuel injectors, and BMP engine blocks and heads). This can mean that Bosch injectors, for example, are considered OEM parts on one car model and aftermarket parts on another model. ==Automotive parts== When referring to automotive parts, OEM designates a replacement part made by the manufacturer of the original part.〔 As most cars are originally assembled with parts made by companies other than the one whose badge appears on the vehicle, it may happen that a car company sells OEM spare parts without claiming to have manufactured the part itself. An automobile part may carry the designation OEM if it is made by the same manufacturer that made the original part used when building and selling the vehicle.〔 The term aftermarket is often used for non-OEM spare parts.〔(Original Equipment Manufacturer (OEM)and Aftermarket Parts ) thepartsbin.com〕 Car collectors speak of cars "originally equipped with (brand ) parts" and of parts that were "original equipment on (make and model of car )." When purchasing parts at national, discount auto parts retailers (e.g., NAPA, Auto Zone, Halfords, Advance Auto Parts, Auto Parts Warehouse, Pep Boys, Motrio, Autobacs, etc.), many parts will have OEM prominently displayed but followed by a qualifier such as "meets OEM standards". Such auto parts are not OEM; they are simply claiming to have been manufactured to the same specifications as the OEM parts—specifications that may well be unpublished and unknowable. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「original equipment manufacturer」の詳細全文を読む スポンサード リンク
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