Electro-Harmonix

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January 23, 2020 at 7:57 pm in reply to: [Electronic Art] SPIRAL – Electro Harmonix – 1979 #125763

Cecco
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I think I’ve found the patent:

https://patentimages.storage.googleapis.com/90/b4/df/cff83d2c9c6b1e/US4264845.pdf

https://patents.google.com/patent/US4264845A/en
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