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| Number | Title | Issue Date |
| 3938886 | Slide projector controllable of its projection time In a slide projector a plurality of slide films contained in a tray are successively selected and shifted to a projected position. A switch is provided which controls movement through a clutch to a running motor of each slide film between its tray-stored ... | 02/17/1976 |
| 3936169 | Device for moving slides vertically in projectors The device is provided with a lever which is pivotally mounted at one end and is urged in the downward direction by a spring, a slide-carrying shoe being attached at the free end of the lever. The lever has an upwardly curving centre portion which rests o... | 02/03/1976 |
