#sandglass__sandglas  timepiece in which the passage of time is indicated by the flow of sand from one transparent container to another through a narrow passage
  supertype:  #timepiece__timekeeper  a measuring instrument or device for keeping time
  subtype:  #egg_timer__eggtimer  a sandglass that runs for three minutes; used to time the boiling of eggs
  subtype:  #hourglass__hourglas  a sandglass that runs for sixty minutes

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