4. Optics: image projectors
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Overhead projector with image direction adjusting device

Optics: image projectors – Film gate
Patent

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Overhead projector with pivoting lamp changer and color adjustme

Optics: image projectors – Lamp control – Lamp position adjustable
Patent

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Overhead projector with small and large stage surfaces

Optics: image projectors – Particular condenser
Patent

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Overhead projector with vibration control head

Optics: image projectors – Housing
Patent

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Overhead projectors

Optics: image projectors – Shutter
Patent

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Overhead type file sheet projectors, and file sheets and jacket

Optics: image projectors – Selective data retrieval – Plural picture rows on single microcard
Patent

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Overheat prevention device

Optics: image projectors – Temperature control – Blower
Reexamination Certificate

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Overlapping waveform utilization in projection systems and...

Optics: image projectors – Lamp control
Reexamination Certificate

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