Tractor beam power-generator trenchCanonLegendsInfinities Non-canon appearances LEGO Star Wars: The Complete SagaLEGO Star Wars II: The Original TrilogySources Star Wars BlueprintsAppearancesThe Life and Legend of Obi-Wan Kenobi (Unknown)Unknown UnknownNoneStar Wars: Episode IV A New Hope (First appearance) (Unknown)Unknown UnknownNoneStar Wars: Episode IV A New Hope junior novelization (Unknown)Unknown UnknownNoneStar Wars (1977) 4 (First identified as Tractor beam power-generator trench) (Unknown)Unknown UnknownNoneStar Wars (1977) 52 (Unknown)Unknown UnknownNone