#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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