Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 5970795 | Apparatus and method for testing attenuation of in-use insert hearing protectors The system is designed for the purpose of providing a means of conducting objective assessment of the actual or "real world" attenuation which is provided by insert-type hearing protection (IHP) devices. A device is constructed to serve as the input devic... | 10/26/1999 |
