4. Education and demonstration
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  6. Common carrier for visual means and audio recording
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Audio visual apparatus and method

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

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Audio-visual teaching machine

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

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Audio-visual teaching machine and control system therefor

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

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