Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 4471647 | Gas chromatography system and detector and method There is described a gas chromatographic assembly formed on a semiconductor wafer by etching techniques. There is also described an improved thermal detector for use therewith.... | 09/18/1984 |
