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Continue to ChatRockin' Patent - Richard Martin Kopesec's "Simulated Stringed Instrument Practice Device" https://www.russellip.com/rockin-patent-richard-martin-kopesecs-simulated-stringed-instrument-practice-device/
Rockin' Patent - Richard Martin Kopesec's "Simulated Stringed Instrument Practice Device" https://www.russellip.com/rockin-patent-richard-martin-kopesecs-simulated-stringed-instrument-practice-device/