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 |
| 4242627 | Battery charger A battery charging system for charging a battery from an AC source, including control rectifier means for rectifying the charging current, a pulse generator for triggering the rectifier to control the transmission of current to the battery, phase control ... | 12/30/1980 |
