BERTIL was built by Cook, Welton & Gemmell at Beverley in 1962, YN 975
1962: Goteborgs Bogserings-Och Barnings
1977: Broströms Rederi AB, Gothenburg
1978: Neptune Rödabolaget AB, Gothenburg
1984: Trollhättan Kanalverk, Trollhättan; renamed VILHELM HANSEN
1995: National Sjöfartsverk, Trollhättan