Pen Crystal Radio.
I named the pen crystal radio because the body was made of a pen
Simple Crystal radio with spider mini amplifier.
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Steampunk Crystal Radio Band MW / SW
Card Crystal Radio
I named the radio crystal card because it uses the body of the card. For a scheme that uses a 456 crystal resonator maybe the first in the world because I myself have never found a crystal radio scheme that uses a 456 filter and I made it.
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