Hartwell Corporation manufactures latches and hinges for use in airplanes. The company s products are sold directly to manufacturers of airplanes and airplane components. Hartwell has two subsidiaries, Hasco and Southco. Hasco markets the latches and hinges manufactured by its parent company to distributors throughout the United States; Southco manufactures metal pins that are key components of Hartwell s latches and hinges. The company holds headquarters in Pacentia, Calif. and was founded in 1939.