"EGTH" . . "(from 1947)" . . "669.9504" . "Hatfield Aerodrome" . . "Hatfield site was closed" . "Concrete" . "Hatfield aircraft factory" . "06/24" . "become part of" . . . "Hatfield aerodrome" . . "HTF" . . "airfield and aircraft factory" . . . . "77.4192" . . "670.0" . . "77.0" . "1822.704" . "De Havilland Aircraft factory" . . "Hatfield" . "Grass" . . "1823.0" . "14/32" . "Hatfield Aerodrome" .