Parker Hannifin makes the components that let machines move: hydraulic pumps, valves, seals, filtration systems and pneumatic controls found in construction equipment, factories, ships and aircraft. No single product dominates; the company sells hundreds of thousands of parts through a vast distributor network, many for equipment that must be maintained for decades. Aerospace has grown into a major segment, expanded by the Meggitt acquisition. Founded in 1917, Parker has raised its dividend for decades without interruption, one of the longest streaks in industry.