4. Optics: image projectors
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Random access control apparatus and method for slide projector

Optics: image projectors – With sound accompaniment
Patent

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Rear projector and producing method thereof

Optics: image projectors – With sound accompaniment
Reexamination Certificate

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Recordable projector

Optics: image projectors – With sound accompaniment
Reexamination Certificate

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Reset mechanism for an audio-visual device

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

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