The Free On-line Dictionary of Computing (30 December 2018):

Original Equipment Manufacturer

    (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)