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Book with rotating cut-out portion

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

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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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Educational board game

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

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Educational book with interactive elements

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

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Method of instruction

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

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Music education aid

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

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Select a story book

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

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