#rocket_engine__rocket  a jet engine containing its own propellant and driven by reaction propulsion
  supertype:  #jet_engine__jetengine  a gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion
  subtype:  #takeoff_booster  #nuclear_rocket  #retrorocket  #space_rocket  #thruster
  part of:  #rocket  any vehicle propelled by a rocket engine

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