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 |
| 4032457 | Plural stage filter cartridge wherein at least one stage comprises pulverized particulate material A multiple phase filter cartridge is presented wherein the filter has two or more distinctly different fibrous layers with at least one of the fibrous layers containing active particles. The different layers are formed in place on the filter by a wet accr... | 06/28/1977 |
