two, three and four-cylinder engines. In 1968, the Unified Series II (UŘ II) was launched. It included many innovative features for the time, e.g. the world's first safety cabin with rollover protection system, mounted on vibration isolators. The new cabin also helped to reduce noise in the cabin to below 85 dB. Thanks to these innovative procedures, the Zetor brand was globally acclaimed and topped the charts of global tractor manufacturers. In the 1970s, the first six-cylinder Zetor Crystal 12011 tractor was designed. In 1976, Zetor became the name of both the brand and the company. The company continued to evolve and, in 1991, the Unified Series III was launched. It was upgraded at the turn of the millennium and was branded the Zetor Forterra. The Unified Series III (UŘ III) was launched in 1992, with models 7520, 7540, 8520, 8540, 9520, 9540 and 10540, having power outputs of between , badged as Model 92. In 1994, the 7320 Turbo and 7340 Turbo models extended the range. In 1997, the production of models 3321 super-7341 super turbo was launched, badged Model 97. The turn of the millennium was a period of significant change for the Zetor brand. It could have disappeared, because the state-owned enterprise faced bankruptcy. In June 2002, HTC Holdings of Slovakia became the owner of Zetor. The new owners invested money to stabilise and restructure the enterprise. Current models Zetor produces six tractor model ranges: Zetor Utilix, Zetor Hortus, Zetor Major, Zetor Proxima, Zetor Forterra, and Zetor Crystal. Utilix and Hortus The new Utilix and Hortus lineups were introduced in the first quarter of 2018. New tractors are small and light, equipped with 4-cylinder engines with power outputs of between . Zetor Major Zetor Major range was launched in the early 2002. It was a simple tractor with a power output of , appreciated for its reliability and low operating costs. In 2015, the Major range was extended by a new type Major 60 with a power output of . In late 2016, the company launched new Major HS, which offered higher comfort while retaining low operation costs. Tractors of the Major range included in the medium-power class are appreciated for easy operation and service. Zetor Proxima The Proxima range entered the market in 2004. It is a universal farming tractor employing Zetor four-cylinder engines. They could be used in conjunction with farming machines, industrial adaptors and