#delay_line__delayline  a circuit designed to introduce a calculated delay into the transmission of a signal
  supertype:  #electrical_circuit__circuit__electric_circuit  an electrical device that provides a path for electrical current to flow
  subtype:  #acoustic_delay_line__sonic_delay_line__sonicdelayline  a delay line based on the time of propagation of sound waves
  subtype:  #electromagnetic_delay_line__electromagneticdelayline  a delay line based on the time of propagation of electromagnetic waves

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