Album type slide suspension device

Animated visual effect adaptor for gated still picture projector

Apparatus for use in projecting a picture image onto a remote su

Audio-visual cartridge

Backprojection transparency viewer

Cassegrainian microfiche lens construction

Collapsible slide carousel

Device for mounting diapositives in a strip and an apparatus for

Device for mounting diapositives in a strip and an apparatus for

Devices for supporting and transporting overhead transparencies

Display adapter for overhead projector presentation

Doublet lens microfiche construction

Envelope for transparencies

Envelope for transparencies for overhead projectors and like pro

Envelope for transparency

Envelope for transparency

Envelope for transparency having increased flexibility

Extension platform to support transparencies for an overhead pro

Film card with reference frame

Film slides having data windows