#roller.cylinder  a cylinder that revolves
  supertype:  #cylinder.solid  a solid bounded by a cylindrical surface and two parallel planes (the bases)
  part of:  #roller_blind
  subtype:  #garden_roller  heavy cast-iron cylinder used to flatten lawns
  subtype:  #paint_roller__paintroller  a roller that has an absorbent surface used for spreading paint
  subtype:  #platen  the roller on a typewriter against which the keys strike
  subtype:  #sprocket  roller that has teeth on the rims to pull film or paper through
  subtype:  #trundle  small wheel or roller

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