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 |
| 6890203 | Card connector reduced in operating force In a connector including an insulator (21), a conductive contact (11) held by the insulator, and a cover (31) openable and closable for bring the card into press contact with the contact, the insulator has a holding portion (21) formed at... | 05/10/2005 |