Rear-projection screen assembly

Receiving system having pre-selected directional response

Reciprocating drawer type photographic apparatus and method

Recirculation document handling methods and apparatus and...

Recirculative document duplex copying

Recirculative document duplex copying

Reconnaissance system using an aerial vehicle spinning about...

Record card machine

Record card structure

Record display device

Record for an audio-visual device

Record handling device

Record strip

Recorded image detection system for updatable microfilm

Recording drum arrangement

Rectangular mounting frame

Reduced height transmissive overhead projector

Reduction camera

Reel adaptor

Reel and film retaining means