Established in 1890, the Kubota Corporation has a long history of manufacturing agricultural machinery in Japan. With an excellent line of compact tractors, necessary on smaller Japanese farms, Kubota entered the North American market in 1969. In 1974, Kubota introduced a 12 HP four-wheel drive tractor in the US. Prior to that point, US manufacturers did not use four-wheel drive except in the largest models.
Kubota Corporation - official site
Kubota Engines - identify year of a Kubota engine