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 |
| 7552544 | Digital displacement measuring instrument A rotor bushing restrictor (50) that prevents a rotor bushing (44) from moving away from a stator (42) is provided. The rotor bushing restrictor (50) includes a fixing member (51) fixed on a body and a rotor bushing attitude retain... | 06/30/2009 |