Mechanical devices, including tractors and implements, used in farming to save labour. The great variety of farming devices covers a wide range of complexity, from simple hand-held implements used since prehistoric times to the complex harvesters of modern mechanized agriculture. From the early 19th century to the present, the chief source of power in farming has changed from animals to steam power, then to gasoline, and finally to diesel. In developed countries, the number of farmworkers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.
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The National Farm Machinery Show is recognized as one of the largest indoor farm machinery expositions in the United States. The show is typically held annually in February at the Kentucky Exposition Center in Louisville, Kentucky. Attendance exceeds 300,000 people, with 800 exhibitors in display space of 1.2 million square feet.
The exposition produces an estimated economic impact of $21.5 million each year, the most of any event held at the Kentucky Exposition Center.