Avery Elevator Corporation - Home Avery Elevator Corporation, Upper Marlboro MD, Corp, AEC, Avery, Elevator, Corporation, modernization, construction, maintenance, Avery Elevator Corporation was founded April of 1980. Our primary business for the past years has been constructions, modernization, maintaining, and servicing vertical transportation equipment. Equipment in our care ranges from the very earliest kinds to the most sophisticated state-of-the- art applications.