Abstract: The present invention is an easily detachable “rail clip” to provide an inexpensive, rapid and secure fastening means to affix sight components, flashlights, lasers, electrical wires, tags, tools, carrying straps, or other tactical gear or accessories to a standardized firearm mounting rail as defined by MIL-STD-1913(AR). The herein disclosed rail clip is economically manufactured as a single piece spring without moving parts, can be operated silently, can be repositioned in seconds, and can be attached and detached from the weapon without the need for any tool making this an important alternative attachment means for military and police forces.

Abstract: A display system having a single-frame transparency which contains four independent images, each of the images having spaced apart groups of pixels interlaced with the groups of pixels from each of the other images, each of the images being selectable for projection by a movable grid mask, is provided. A method for preparing and displaying four images from a single-frame transparency is also disclosed. The single-free transparency having interlaced groups of pixels from four individual images is formed from four individual transparencies having a copy pattern formed thereon, the copy pattern being divided into spaced apart square shaped groups of pixels defining a matrix of translucent optic segments.

Abstract: A shuttle display apparatus including a base formed with multiple sets of pairs of parallel lateral tracks connected together on their opposite ends by respective longitudinal shuttle tracks. Display panels are racked together for translinear travel progressively in such lateral tracks to selectively display, in coplanar relationship, the respective front sides of a pair of such panels in one direction and to thereafter selectively display the back sides of such panels in coplanar relationship in the opposite direction. A drive is provided for automatically advancing a pair of panels along a pair of lateral tracks and then shuttling one panel of the pairs to an adjacent pair of lateral tracks to dispose such pair of panels abreast of one another in a coplanar displaying position for displaying composite messages in one direction or another.