4. Music
  5. Accessories
  6. Teaching devices

Juan M. Del Castillo

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Chord playing attachment for a stringed instrument

Music – Instruments – Stringed
Patent

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Device to identify chords on a keyboard instrument and key mecha

Music – Accessories – Teaching devices
Patent

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Device to identify chords on a keyboard instrument and key mecha

Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent

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Optical metronome

Music – Accessories – Teaching devices
Patent

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Optical metronome

Music – Accessories – Teaching devices
Patent

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Profile ID: LFUS-PAI-P-934639

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