"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 |
| 6237782 | Display system A display system having a first card having oppositely facing first and second surfaces, at least one display object on the first surface, and a spacer assembly with a first spacer element that is attached to the first card and projects from the first sur... | 05/29/2001 |
| 6176558 | Cassette display unit A display system having a frame, a storage space on the frame for an object to be displayed, a closure element on the frame that is repositionable between a closed position and an open position, a loading opening through at least one of the frame and clos... | 01/23/2001 |