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 |
| 4725835 | Time multiplexed bus matrix switching system Ports including at least input and output signal lines are collected into port groups. For each port group three separate clock synchronized time division switches are connected respectively to the input signal lines, bus highways and the output signal li... | 02/16/1988 |
