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| Number | Title | Issue Date |
| 4171882 | Light reflective projection system A light reflective projection system is disclosed. The system includes a combination of a light source, at least one reflective or transparent disc having means for rotation thereof and a lens. In one embodiment, disc rotation is provided by the rotatable... | 10/23/1979 |
| 3942884 | Interactive audio-visual apparatus A device for the viewing of photo-images and the presentation of sound recordings corresponding to such photo-images, which device may be controlled by the user to provide substantially random access to any photo-image and the sound recording correspondin... | 03/09/1976 |
