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 |
| 3971119 | Manufacture of rings comprising separable segments A ring comprising separable segments especially for seating against a rotary seal and a method of manufacturing such a ring which comprises forming and assembling the segments into the ring, clamping the ring segments together, e.g. by bolts, forming at l... | 07/27/1976 |
