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Overhead projector

Optics: image projectors – Epidiascope
Patent

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Overhead projector

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

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Overhead projector

Optics: image projectors – Lamp control
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Overhead projector

Optics: image projectors – Episcope – Reflector between lamp and screen
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Overhead projector

Optics: image projectors – Episcope – Reflector between lamp and screen
Patent

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Overhead projector

Optics: image projectors – Episcope – Reflector between lamp and screen
Patent

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Overhead projector

Optics: image projectors – Miscellaneous
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Overhead projector

Optics: image projectors – Temperature control – Blower
Patent

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Overhead projector

Optics: image projectors – Reflector – Plural
Patent

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Overhead projector

Optics: image projectors – Miscellaneous
Patent

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Overhead projector

Optics: image projectors – Temperature control – Blower
Patent

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Overhead projector

Optics: image projectors – Miscellaneous
Patent

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Overhead projector

Optics: image projectors – Temperature control – Blower
Patent

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Overhead projector

Optics: image projectors – Temperature control – Blower
Patent

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Overhead projector

Optics: image projectors – Episcope – Reflector between lamp and screen
Patent

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Overhead projector

Optics: image projectors – Epidiascope
Patent

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Overhead projector

Optics: image projectors – Housing
Patent

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Overhead projector

Optics: image projectors – Housing
Patent

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Overhead projector

Optics: image projectors – Reflector
Patent

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Overhead projector

Optics: image projectors – Lens support – Lens position adjustable
Patent

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