4. Optics: image projectors
  5. With sound accompaniment
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Magazine for slides for the simultaneous projection of pictures

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

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Magnetic tape carrier

Optics: image projectors – With sound accompaniment
Patent

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Mechanical sound reproducing means for an audio-visual device

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

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Microprocessor controlled filmstrip projector

Optics: image projectors – With sound accompaniment
Patent

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Multimedia display device

Optics: image projectors – With sound accompaniment
Reexamination Certificate

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Multimedia display device

Optics: image projectors – With sound accompaniment
Reexamination Certificate

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Multiple-function projecting apparatus

Optics: image projectors – With sound accompaniment
Reexamination Certificate

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