4. Education and demonstration
  5. Means for demonstrating apparatus, product, or surface...
  6. Chalkboard or equivalent means having easily erasable surface
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Portable drawing surface with interchangeable components

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent

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Portable drawing system

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Reexamination Certificate

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Portable free-standing visual aid

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent

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Pre-writing teaching aid and method to assist beginning...

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Reexamination Certificate

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