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 |
| 7275396 | Apparatus and method of supporting an earring An earring support device constructed of a single length of flexible metal wire or plastic line bent back upon itself at both ends and clasped or otherwise fasted so as to form a large loop at one end and one or more smaller loops at the other end. ... | 10/02/2007 |
| 7159984 | Subjective optometric apparatus Disclosed is a subjective optometric apparatus in which the earpiece members and the nose pad member for attaching the main body of the device to the subject can be easily adjusted without involving any effort. The subjective optometric apparatus has a horizontal fr... | 01/09/2007 |
| 5557345 | Interchangeable tethered glasses Interchangeable tethered glasses for adjustably positioning relative to a face of an individual for filtering light into eyes of the individual. The inventive device includes a frame assembly for supporting a pair of lenses over eyes of an individual. An ... | 09/17/1996 |
