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In page Hughes Aircraft Company:

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During World War II the company designed and built several prototype aircraft at Hughes Airport. These included the famous Hughes H-4 Hercules, better known by the public's nickname for it, the Spruce Goose, the H-1 racer, D-2, and the XF-11.[1] However the plant's hangars at Hughes Airport, location of present-day Playa Vista in the Westside of Los Angeles, California, were primarily used as a branch plant for the construction of other companies' designs. At the start of the war Hughes Aircraft had only four full-time employees—by the end the number was 80,000.[2][3] During the war, the company was awarded contracts to build B-25 struts, centrifugal cannons, and machine gun feed chutes.[4]