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Continue to ChatRockin’ Patent – Optek Music Systems Inc’s “Fingering Display For Musical Instrument” https://www.russellip.com/rockin-patent-optek-music-systems-incs-fingering-display-for-musical-instrument/
Rockin’ Patent – Optek Music Systems Inc’s “Fingering Display For Musical Instrument” https://www.russellip.com/rockin-patent-optek-music-systems-incs-fingering-display-for-musical-instrument/