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Building on the success of the Goose and Widgeon, Grumman Aircraft developed Design 73, the larger "Mallard" for commercial use. Retaining many of the features of the smaller aircraft, such as twin radials, high wings with underwing floats, retractable gear and a large straight tail, the company built 59 Mallards between 1946 and 1951. Unlike the smaller aircraft, the Mallard featured tricycle gear, a stressed skin, two step hull and wingtip fuel tanks.