Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 5799427 | Overlapping merchandise information display module The invention relates to improvements to a merchandise information system having a plurality of overlapping display items each having on opposite sides thereof information concerning available merchandise at a remote location. The system includes a suppor... | 09/01/1998 |
