- Date: April 10, 1922-April 2, 1924
- 833 khz (April 10, 1922-April 2, 1924)
- 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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