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Crystal Radio, Ferrite Coil Model #2 (4K)
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RADIO casera SIN ELECTRICIDAD. Fabricación a mano de la RADIO GALENA y su curioso funcionamiento
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How to Make/Build a Crystal Radio
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Crystal Radio--Hi Q Hoop Coil--Copper vs Litz (4K)
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Crystal Radio
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How To Make A Crystal Radio - No Batteries (Updated Version Available)
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Super Crystal Radio Set
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