Ericsson Crystal radio set type 0/1002 with cat's whisker circa 1922 to 1924 BBC Type Approved by Postmaster General JMH4913 Stock Photo - Alamy
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Cat's-whisker detector
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Crystal Detector: Cat's Whisker Radio Detector » Electronics Notes
Crystal detector - Wikipedia
BBC - A History of the World - Object : 'Cat's Whisker' radio device
