Registry device for transparencies for overhead projector
Remote stereo microscope with field mirror reflected ocular path
Remote-controlled slide projector
Removable remote control unit for a slide projector
Removable vehicle entertainment system
Replaceable color wheel
Reset mechanism for an audio-visual device
Resilient frame construction for displaying transparencies
Resolution scalable view projection
Restraining temperature rise in light exiting-side polarizer...
Retractable image projecting system
Retracting head up display with image position adjustment
Retrieval control apparatus for microfilm reader
Retrieving images stored on windowed discs
Retro-reflective light diffusing display systems
Retrofocus lens for overhead projector
Retroreflective array virtual image projection screen
Reusable presentation frame for overhead transparencies
Reverse projection system for moving imagery
Rod integrator holder and projection type video display