The Ursus Factory was founded in Poland in 1893 on 15 Sienna Street, Warsaw, by three engineers and four businessmen. It began producing exhaust engines and then later trucks and metal fittings intended for the Russian Tsar. In 1930, the Ursus factory fell on hard times due to the world financial crisis and was nationalised under the National Engineering Works, (PZInż), the Polish manufacturer of arms and vehicles. It then began producing military tractors, tanks and other heavy machinery for troops. During World War II, PZInz was relocated to Germany by the Germans and the remains were destroyed. After the war, the Ursus Factory was rebuilt and started producing the Ursus C-45, a copy of the German pre-war Lanz Bulldog tractor. During the 1950s, the Ursus factory began producing tractors using a Zetor-based design. By 1961, there was a growing need for tractors in Poland, but the tractors produced by the Ursus factory did not meet the needs of Polish agriculture. A bilateral agreement was created between Poland and Czechoslovakia, where Czechoslovakia would provide the Ursus factory with the parts necessary to enlarge and modernise the factory and in exchange, Poland would supply Czechoslovak factories with raw materials. The goal was to construct a joint tractor industry where Poland and Czechoslovakia would combine to produce 120,000 tractors per year. More Ursus Mechanical Plant in Warsaw: http://lantret.deviantart.com/gallery/62617579/Ursus-Mechanical-Plant-in-Warsaw https://www.urbex-travel.com/abandoned-ursus-factory/