An oven system comprises a grill unit and a microwave oven unit built into a standard kitchen unit framework or other structure for receiving same with the grill unit surmounting the microwave oven unit. A duct extends from the rear of the microwave oven unit, upwardly past the rear of the grill unit,...http://www.google.es/patents/US4598689?utm_source=gb-gplus-sharePatente US4598689 - Oven systems
