Ursus Farm tractors by series

Zaklady Mechaniczne URSUS (Ursus Mechanical Works) began in 1893 in Warsaw, making agricultural products. Their first tractor was built in 1922. In the 1950s, Ursus began building tractors used Zetor-based designs, with great success. In the 1970s, Ursus entered into a licensing arrangment with Massey Ferguson for tractor designs.

Ursus - official site