#elastic_device__elasticdevice  any flexible device that will return to its original shape when stretched
  supertype:  #device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  #rubber_band__elastic_band__elasticband__elastic  a narrow band of elastic rubber used to hold things (such as papers) together
  subtype:  #spring  a metal elastic device that returns to its shape or position when pushed or pulled or pressed; "the spring was broken"
     subtype:  #bedspring  (usually plural) one of the springs holding up the mattress of a bed
        subtype:  #box_spring__boxspring  a coiled bedspring in a frame that is covered with cloth
     subtype:  #coil_spring__volute_spring  a spring in the shape of a coil
     subtype:  #leaf_spring  long narrow spring consisting of several layers of metal springs bracketed together
     subtype:  #mainspring  the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
     subtype:  #spiral_spring  a spring that is wound like a spiral
        subtype:  #hairspring  a fine spiral spring that regulates the movement of the balance wheel in a timepiece

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