Abrams Company manufactured a wide variety of parts for use in automobiles, trucks, buses, and farm equipment. There were three major groups of parts: ignition parts, transmission parts, and engine parts. Abrams' parts were sold both to original equipment manufacturers (OEMs and to wholesalers. The wholesalers, in turn, resold the parts to retailers who sold them as replacement parts to consumers. The latter market was called the "aftermarket (AM).