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In page Parker Hannifin:

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During World War II, Parker experienced a boom in business as the U.S. Air Force's primary supplier of valves and fluid connectors.[2] By 1943, the firm employed 5,000 Cleveland, Ohio, residents. After Arthur Parker's death in 1945[5] and the end of the war, the company neared bankruptcy due to the sudden drop in demand. Arthur Parker's wife, Helen Parker, assumed control of the company and prevented its liquidation.[6] She hired new management staff and directed the company's focus back to civilian manufacturing.[5]