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 Close-up view of Hand Held Maneuvering Unit for Gemini 8 Close-up view of the Hand Held Maneuvering Unit which will be used by Astronaut David R. Scott during the extravehicular activity on the Gemini 8 space flight. High pressure cold gas released through the unit's nozzles produces the required controlled thrust to maneuver in a zero-gravity environment. 
 
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