 Notable companies in this sector include OAO Novosibirsk Electrode Plant, OAO Novosibirsk Tin Mill and OAO Kuzmin Novosibirsk Metals Plant.In the mechanical engineering sector, electrical and optical machinery and equipment accounted for 7.2% of total industrial output; machinery and equipment (exclusive of weapons or ammunition) accounted for 3.7%, while electrical machinery and transport equipment accounted for 4.5%.One of the largest companies is the aircraft-maker Novosibirsk Aircraft Production Association, which assembles Su-34 fighters, among others.