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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4994834 | Focal plane shutter for cameras The forcal plane shutter for cameras is equipped with a first release lever capable of retaining a rear blade group at position to close an exposure aperture, and a second release lever capable of maintaining a front blade group and the rear blade group a... | 02/19/1991 |
| 4893142 | Device for activating motor-driven shutter blades A device for activating shutter blades relative to a shutter opening and utilizing a control signal from an electronic circuit includes an electric motor rotatable clockwise and counterclockwise according to a control signal from the electronic circuit, a... | 01/09/1990 |
| 4306796 | Shutter assembly for photographing devices with precision timing facility A between-lens shutter assembly for photographing devices comprising at least two, preferably three rotary plates with axes parallel to the axis of the lenses. Each plate comprises an opening. When the plates are rotated with common speed, the openings mo... | 12/22/1981 |
| 4041511 | Driving device of lens shutter of single-lens reflex camera A lens shutter for a quick-return single-lens reflex camera in which the diaphragm blades and shutter blades are operated by an operating ring driven rotationally in opposite directions by a driving device. The driving device has a pair of axially biased ... | 08/09/1977 |
