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 | | The Merlin, probably the only aero engine ever to become a household name, was developed in the early 1930s by Rolls-Royce, a company with a long history of designing world class automobiles and aero engines. |
 | | Bristol manufactured high-powered air-cooled radial engines, favoured for the emerging airlines; Armstrong-Siddeley also manufactured radials, though of less developed design, which were used in RAF training aircraft and in many military aircraft sold for export; Rolls-Royce built water-cooled in-line engines, chosen by aircraft designers for the clean aerodynamic nose they allowed on high-speed fighters. |
 | | The Merlin was also the subject of a major industrial effort with over 150,000 examples being produced by Rolls-Royce at Derby, Crewe and Glasgow, by the Ford Motor Company in Manchester and by Packard in the United States. |
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