#bedspring  (usually plural) one of the springs holding up the mattress of a bed
  supertype:  #spring  a metal elastic device that returns to its shape or position when pushed or pulled or pressed; "the spring was broken"
  subtype:  #box_spring  a coiled bedspring in a frame that is covered with cloth
  part of:  #bedstead__bedframe  the framework of a bed
     part of:  #bed  a piece of furniture that provides a place to sleep; "he sat on the edge of the bed"; "the room had only a bed and chair"

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