"Halford, Frank"@en . . "1955Z"^^ . . . . . "Major Frank Bernard Halford CBE FRAeS (7 March 1894 \u2013 16 April 1955) was an English aircraft engine designer. He is best known for the series of de Havilland Gipsy engines, widely used by light aircraft in the 1920s and 30's."@en . "1894-03-07Z"^^ . "Frank Halford"@en . . "1955-04-16Z"^^ . "British aerospace engineer" . "1894Z"^^ . . . . . .