. "Hall-effect engines" . "electric propulsion systems" . . "Hall-effect ion thrusters" . . . . . . "Stationary Plasma Thruster" . . "Hall-effect" . "Hall effect thruster" . . . "hall thrusters" . . . "hall-effect thruster" . . "Hall thrusters" . "Stationary Plasma Thrusters" . "Hall-effect thrusters" . . . "Hall-effect thruster" . . "Hall-effect electric propulsion" . "Hall-effect thruster" . . "Hall thruster" . "electric propulsion system" . . . . . "Hall effect" .