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 |
| 7138145 | Method and apparatus for ozination of grain A method for treating grain comprising circulating concentrated ozone through an evenly distributed column of grain to maintain a concentration of between 50 and 100 ppm. ... | 11/21/2006 |