4. Optics: image projectors
  5. Cabinet encloses projector and one side of screen
  6. Focus or variable magnification
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Film projection system

Optics: image projectors – Cabinet encloses projector and one side of screen – Focus or variable magnification
Patent

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Focus and aim device and method for image projection

Optics: image projectors – Cabinet encloses projector and one side of screen – Focus or variable magnification
Reexamination Certificate

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