4. Education and demonstration
  5. Means for demonstrating apparatus, product, or surface...
  6. Plaque to selectively align different points on plaque...
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Device for composing and decomposing chords and scales

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Plaque to selectively align different points on plaque...
Patent

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Display board for educational exercises

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Plaque to selectively align different points on plaque...
Patent

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