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 |
| 7667120 | Training method using specific audio patterns and techniques A method is disclosed that utilizes specific techniques, based upon empirical study, to significantly increase the ability of a trainee to remain focused on the training materials and subject matter and actually learn and retain the training subject matter. More spe... | 02/23/2010 |