The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 7011163 | Horseshoe including calks The present invention teaches a horseshoe including a plurality of calks for enhancing traction. The calks are located on sloped interior side wall portions of the horseshoe. Each calk includes a small rounded leading end and a rearwardly and outwardly tapered surfa... | 03/14/2006 |