4. Education and demonstration
  5. Audio recording and visual means
  6. Image projector
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Educational and training simulator system and method

Education and demonstration – Audio recording and visual means – Image projector
Patent

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Information reproducer and information creating unit

Education and demonstration – Audio recording and visual means – Image projector
Patent

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Mechanical assembly for audio-visual teaching machines

Education and demonstration – Audio recording and visual means – Image projector
Patent

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