4. Education and demonstration
  5. Audio recording and visual means
  6. Common carrier for visual means and audio recording
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Personal learning system

Education and demonstration – Audio recording and visual means – Common carrier for visual means and audio recording
Patent

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Position-sensitive educational product

Education and demonstration – Audio recording and visual means – Common carrier for visual means and audio recording
Reexamination Certificate

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Presentation apparatus

Education and demonstration – Audio recording and visual means – Common carrier for visual means and audio recording
Patent

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Process of human-machine interactive educational instruction usi

Education and demonstration – Audio recording and visual means – Common carrier for visual means and audio recording
Patent

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