Seen from an airplane window, a green circle on farmland is probably the work of a center pivot: a long steel arm on wheels that turns around a fixed point, watering the crop. Lindsay builds these machines for growers around the world. After the first sale it keeps selling parts and controls, plus farm technology such as FieldNET for managing irrigation remotely. A smaller business makes road-safety gear for highway agencies, such as crash cushions and moveable barriers.
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