Abstract: A one-way vision perforated display panel that includes a transparent protective envelope having at least one open side edge and an adhesive applied to at least a portion of an outwardly-facing side of the envelope defined by a front sheet for adhering the envelope to an inner surface of a transparent support panel, and a one-way vision, perforated sheet having a display image on one side for being inserted into the protective envelope through the at least one open side edge with the display image visible through the outwardly-facing side of the envelope and the transparent support panel.

Abstract: An information displayer with interchangeable boards for use in displaying advertising messages. Two sets of boards are disposed on two chains respectively, with each chain rotating about a pair of pinions. One pinion is stationary while the other is connected to a stepping motor. Hooks on a rigid bar grasp openings in the boards to release and display the boards. A pre-programmed microprocessor controls the stepping motor, permitting the boards to be displayed in any selected manner.