Drive for a circular magazine of a slide projector

Drive mechanism for a spiral array of individual film photograph

Drive sense adjusting apparatus and drive sense adjusting...

Drum-type slide magazine

Dual display

Dual DMD projector having a modular heat dissipation device

Dual film strip projector

Dual grooved Fresnel lens for overhead projection

Dual image slide and/or video projector

Dual lamp illumination system

Dual lamp illumination system using multiple integrator rods

Dual lens image rotation system

Dual mode laser projection system for electronic and film...

Dual mode overhead projection system using field emission device

Dual photographic slide projector

Dual photographic slide projector

Dual polarization optical projection systems and methods

Dual purpose photographic displays

Dual slide projector and tray

Dual-magnification rear projection lectern