{HEAD ~ A heat exchange unit} 3 wherein said closed end hydride container contains an essentially coaxial spring defining {TAIL ~ a central hydrogen gas space} and confining metallic hydride former against the tube wall 
{ HEAD ~ A heat exchange unit } 3 wherein said closed end hydride container contains an essentially coaxial spring defining { TAIL ~ a central hydrogen gas space } and confining metallic hydride former against the tube wall
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