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 |
| 5711714 | Add-on-hand-powered swinging mechanism for a porch swing or the like An add-on hand-powered swinging mechanism for a porch swing or the like including an extension bar securable to a fixed surface adjacent the existing porch swing at one end thereof and having a pulley connection mechanism at a second end thereof; a pulley... | 01/27/1998 |
