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 |
| 20130113411 | SERVOMOTOR DRIVE DEVICE THAT DRIVES SERVOMOTOR CONNECTED TO ROTATING SHAFT A servomotor drive device has a first converter, a regenerative resistor circuit having a first switching element and a regenerative resistor, a first connection part configured to connect a second converter in parallel to the regenerative resistor circuit in an attacha... | 05/09/2013 |
| 20070006845 | Electronic throttle control system with integrated controller and power stage One embodiment includes an apparatus comprising a closed loop feedback controller and a power output stage to couple to the closed loop feedback controller. The closed loop feedback controller and the power output stage are combined to form a single element. ... | 01/11/2007 |