#signaling_device__signalingdevice  a device used to send signals
  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:  #bell  a hollow device made of metal that makes a ringing sound when struck
     subtype:  #church_bell  a bell in a church tower (usually sounded to summon people to church); "church bells were ringing all over town"
     subtype:  #cowbell  a bell hung around the neck of cow so that the cow can be easily located
     subtype:  #death_bell__deathbell__death_knell__deathknell  a bell rung to announce a death
     subtype:  #dinner_bell  a bell rung to announce that dinner has been served
     subtype:  #electric_bell  a bell activated by the magnetic effect of an electric current
        subtype:  #telephone_bell__telephonebell  electric bell that rings to signal a call
     subtype:  #fire_bell  a bell rung to give a fire alarm
     subtype:  #Liberty_Bell  the bell of Independence Hall; rung 8 July 1776 to announce the signing of the Declaration of Independence
     subtype:  #school_bell  a bell rung to announce beginning or ending of class
     subtype:  #sheep_bell__sheepbell  a bell hung round the neck of a sheep so that the sheep can be easily located
     subtype:  #shop_bell  a bell attached to the door of a small shop; warns the proprietor that a customer has entered the shop
     subtype:  #sleigh_bell__cascabel  bell attached to a sleigh, or to harness of horse pulling a sleigh
     subtype:  #warning_bell__warningbell  a bell used to sound an alarm
  subtype:  #buzzer  a signaling device that makes a buzzing sound
  subtype:  #foghorn  a warning device consisting of a horn that generates a loud low tone
     subtype:  #diaphone  a foghorn that makes a signal consisting of two tones
  subtype:  #whistle  acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound
     subtype:  #boat_whistle  a whistle on a boat that is sounded as a warning
     subtype:  #factory_whistle__factorywhistle  a whistle at a factory that is sounded to announce times for starting or stopping work
     subtype:  #steam_whistle__steamwhistle  a whistle in which the sound is produced by steam; usually attached to a steam boiler

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