4. Optics: image projectors
  5. With sound accompaniment
  6. Common picture and sound record carrier system
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Audio-visual cartridge and combined audio player and visual view

Optics: image projectors – With sound accompaniment – Common picture and sound record carrier system
Patent

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Audio-visual cartridge and player

Optics: image projectors – With sound accompaniment – Common picture and sound record carrier system
Patent

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Audio-visual device

Optics: image projectors – With sound accompaniment – Common picture and sound record carrier system
Patent

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