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Crystal radio - Wikipedia
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![Slinky Science Remember the golden age of radio? [SLY02012] - HobbyTown](https://images.amain.com/images/large/sly/sly02012.jpg "Slinky Science Remember the golden age of radio? [SLY02012] - HobbyTown")
Slinky Science Remember the golden age of radio? [SLY02012] - HobbyTown
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Crystal Radio -- Budget Cuts 140-pF
