sentences:  The factory has exported its production to various countries, including Argentina, Bulgaria, Colombia, Greece, Mongolia, Hungary, Serbia "etc".The enterprise was founded in Imperial Russia in 1868, but it began producing trolleybuses in 1951.Trolleybus production by the Uritsky factory (ZiU) began in 1951, but the company's first model, the MTB-82d, was a refinement of a design first developed several years earlier, by the national government in Moscow in 1945–46, the MTB-82m (where MTB stood for Moscow Trolleybus).