A tractor in a dusty field, a dump truck at a mine and a long-haul truck all pull in air through a filter that slowly clogs with grit. Donaldson makes air filters for the engines of farm, construction and mining machines and of commercial vehicles. Its industrial side cleans factory air and gases and filters air for power plants, aircraft and military vehicles. The company earns twice: first by winning a place on a new machine, then by selling the replacement filters that machine uses up.
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