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 |
| 6118979 | Method for signaling an incoming telephone call without an audible signal A method of communicating an incoming call through a telephone receiver having an incoming call circuit and an audible signal system operatively connected to the circuit. The incoming call is communicated to a person remotely located from the receiver. Th... | 09/12/2000 |
