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Research Ship (6)

  Oste Trident 980 Germany 1943 1966
  Oste Trident 930 Germany 1943 1976
  Banner Trident Alpha 10195 United States 1944 1968
  Planet Albatros ALK-5 Germany 1967 1967
  Planet (twin hull) Albatros ALK-208 Germany 2004 2004
  Maria S Merian Albatros ALK-211 Germany 2006 2006