4. Optics: image projectors
  5. Light shield, mask, hood, or diaphragm
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Masked image projection system and method

Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate

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Masking device for overhead projector

Optics: image projectors – Light shield – mask – hood – or diaphragm
Patent

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Material selective device

Optics: image projectors – Light shield – mask – hood – or diaphragm
Patent

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Method and apparatus for inhibiting projection of selected...

Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate

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Microform-reader

Optics: image projectors – Light shield – mask – hood – or diaphragm
Patent

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Multi-aperture optical dimming system

Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate

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