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In page Intermediate frequency:
"
- down to c. 20 kHz[citation needed], 30 kHz (A. L. M. Sowerby and H. B. Dent),[2] 45 kHz (first commercial superheterodyne receiver: RCA Radiola AR-812 of 1923/1924),[1] c. 50 kHz,[2] c. 100 kHz,[2] c. 120 kHz[2]
- 110 kHz was used in European AM longwave broadcast receivers.[3][4]
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