#bob.weight  a hanging weight, especially a metal ball on a string
  supertype:  #weight.artifact  an artifact that is heavy
  part of:  #pendulum
  subtype:  #kite_tail  a bob on a kite to provide balance
  subtype:  #plumb_bob__plumbbob__plumb__plummet  the metal bob of a plumb line
  subtype:  #sounding_lead  a metal bob at the end of a sounding line

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