• Date: April 10, 1922-April 2, 1924
  • Frequency:
    • 833 khz (April 10, 1922-April 2, 1924)
  • Location:
  • Owner of license:
    • Prest & Dean Radio Research Laboratory (April 10, 1922-March, 1923)
    • Prest & Dean Radio Co. and Radio Research Society of Long Beach California (...April 2, 1923-June 30, 1923...) ( Note that this does not actually appear to represent a change in ownership.)

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