Original Equipment Manufacturer

company that produces equipment from components purchased in bulk from other manufacturers in order to assemble and market products under the brand name of another company, OEM

Original equipment manufacturer, or OEM, is a term that refers to containment-based re-branding, namely where one company uses a component of another company within its product, or sells the product of another company under its own brand. OEM refers to the company that originally manufactured the product.
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Original Equipment Manufacturer, company which actually manufactures a product

<company> (OEM) A misleading term for a company which repackages equipment, such as computers, made by other companies. Unlike a value added reseller, an OEM does not necessarily add anything except their name to the product. In some cases though they may integrate components into complete systems. OEM arrangements are often made for marketing reasons.
[Origin?]
(2001-04-09)

the supplier that manufactured a key component for another firm’s product.