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 |
| 7536023 | Hearing aid A disposable hearing aid insertable into an ear canal which includes a microphone which translates acoustic energy into electrical signals, signal processing circuitry which processes the electrical signals provided by the microphone, a receiver which converts the p... | 05/19/2009 |
