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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| Application No. | Application Title | Issue Date |
| 20090207079 | Radar sensor for receiving radar wave while judging existence of wave attenuator A radar sensor receives a radar wave signal through a radome in each of antennas while judging existence of an attenuating thing in a detecting unit. This unit extracts a maximum level channel from receiving channels assigned to the antennas every modulation period, cal... | 08/20/2009 |