What is the origin of the word Tehran?
Tehran
Few foreign companies operate in Tehran, due to the government's complex international relations. But prior to the 1979 Revolution, many foreign companies were active in Iran.[54] Tehran's present-day modern industries include the manufacturing of automobiles, electronics and electrical equipment, weaponry, textiles, sugar, cement, and chemical products. It is also a leading center for the sale of carpets and furniture. The oil refining companies of Pars Oil, Speedy, and Behran are based in Tehran.