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Theremin - Wikipedia
Theremin Thor Synthesizer - Pitch and Volume Antenna - Up to 9 Octaves - Fully Analogue - Connects to an Amplifier - Known by Big Bang Theory : Amazon.de: Musical Instruments & DJ
Amazon.com: MicroKits Theremin Electronics Kit | Educational Electronic Music STEAM/STEM Kits for Kids or Adults | No Tools Needed Easy to Build Breadboard Kit : Toys & Games