John Deere-A brand originally known as Deere and Company was founded by a Blacksmith named John Deere who invented the ingenious steel plow which became commercially successful in the year 1837. The company was successful by manufacturing 400 steel plows per year on average. This success from John Deere laid the foundation stone for the success of the company. John Deere tractors are available in a wide price range starting from just Rs 5 lakhs to Rs 30 lakhs. The cheapest John Deere tractor is John Deere 3028EN which is priced at Rs 5 lakhs. The costliest tractor is John Deere 6120 B in India which costs Rs 30 lakhs. In 1947, John Deere introduced its first self-propelled combine, model 55. It was soon followed by the smaller models 40 and 45, the larger model 95, and an even larger model 105 was introduced in the 1960s. In the mid-1950s, Deere introduced attachable corn heads, allowing crop producers to cut, shell, and clean corn in one smooth operation. The new line of four- and six-cylinder tractors, the models 1010, 2010, 3010, and 4010, were more far more powerful than Deere's two-cylinder models, and also easier and more comfortable to operate, with conveniently located controls, better visibility, and improved seat suspension. The 4010 was rated at 80 horsepower in 1960, but tested at 84 horsepower during testing trials, making it one of the most powerful two-wheel-drive farm tractors at that time. The 4010 was the predecessor to the 4020, which is widely regarded as the most popular tractor ever produced by John Deere, and perhaps any tractor manufacturer in the United States. Although the 4020, which was available with Deere's optional Power Shift, enjoyed greater popularity, the 4010 moved John Deere into the modern era of farm tractor technology and design following its successful history as a tractor manufacturer that was by the late 1950s experiencing waning market share due to its outdated technology. In 1989, Deere replaced the 6620, 7720, and 8820 with a new line of completely redesigned 'Maximizer' combines that included the 9400, 9500, and 9600 walker combines. These combines featured a center-mounted cab, rear-mounted engine, and more comforts in the cab. Agricultural products include, among others, tractors, combine harvesters, cotton harvesters, balers, planters/seeders, silage machines, and sprayers. John Deere manufactures a wide range of products, with several models of each in many cases.