Who invented the tractor?

1770, Edgeworth invented a "railway or artificial road that can drive any carriage and move with it" and obtained a patent in Britain. His method is to connect several planks into an endless chain and move continuously in a certain way, so that one or several planks always touch the ground. His purpose is to spread the weight of the carriage to a wider ground when using narrow wheels, so that the carriage can travel on rough or soft ground. However, edgeworth's design stays on drawing paper. American inventor Bater obtained a reptile patent at 1888. 1904, Holt also obtained a very practical patent for the invention of crawler, and put it into mass production in 1906, replacing the rear wheel of the original steam tractor with crawler, and Holden crawler tractor appeared. This is the first tractor that was converted into a tank. In 1904, Hornsby and Sans companies in Britain successfully carried out trial production according to david roberts' much more complicated design. Characterized in that all separated chain links are connected by lubricating bolts. 1907, the first gasoline-driven crawler tractor ran on this track and gave a performance to the War Department. However, due to the decline of military enthusiasm, Hornsby sold their patents to Holt in 19 12.