4. Education and demonstration
  5. Audio recording and visual means
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Educational audio playback device including hidden graphical ima

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

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Electric self-teaching apparatus utilizing printed and auditory

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

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Electrical flash card unit and method of use

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

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