The continuing success and growth of the company is based on its traditional research and development resources. Zetor designs and produces most of its tractor components, including the engines, which are among the most fuel efficient in the industry. In 1960 Zetor produced one of the first hitch-hydraulic systems( Zetormatic), with full-position, draft and mixed control capability. Later it was the first tractor company to manufacture a fully integrated safety cab with insulated, rubber-mounted suspension-later adopted by all other manufactures. Zetor tractors have been sold in the United States since 1982.