 In 1947, the company Christian Salvesen, based in Leith, Scotland, refitted a surplus "Algerine"-class minesweeper (HMS "Felicity") with refrigeration equipment and a factory ship stern ramp, to produce the first combined freezer/stern trawler in 1947.The first purpose built stern trawler was "Fairtry" built in 1953 at Aberdeen.The ship was much larger than any other trawlers then in operation and inaugurated the era of the 'super trawler'.