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 |
| 7337709 | Preservative gas generating device A preservative gas generating device includes a carrier sheet and a layer of a matrix forming material having a preservative gas generating compound dispersed therein. The layer of matrix forming material permits the generation of a preservative gas by the preservat... | 03/04/2008 |
