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 |
| 6543682 | Insulin-dose calculator disk This is a manual circular calculator for determining an appropriate insulin injection dosage to be taken with a meal. Preferably, the calculator has a pair of circular members which rotate around a single common center to allow calculation of the dosage. ... | 04/08/2003 |
| 4551620 | Biorhythms analog computer-calendar A Biorythms analog computer-calendar is provided to display without computations the level of the physical, the emotional, and the intellectual biorythms of a human body. The level of the three biorythms appears on display in analog and digital forms for ... | 11/05/1985 |
