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 |
| 7059618 | Fluid automatic bicycle transmission A bicycle hub having a fluid automatic transmission receiving power input from the rider which uses drag to transfer power from an outer shell being rotated by the drive train to a stator and using applied torque to automatically control mechanical advantage in a li... | 06/13/2006 |
| 7052474 | Pharyngoesophageal monitoring systems Pharyngoesophageal monitoring systems are provided that monitor the environment of the pharynx and esophagus, and in some embodiments, detect and monitor refluxate, and may further record other physical episode data. The system may be provided, in some embodiments, ... | 05/30/2006 |
| 6629410 | Constant velocity transmission A constant velocity transmission which provides maximum torque and speed from a power source such as an internal combustion engine to an output shaft of the transmission while maintaining the engine at optimum operational speed. The transmission takes adv... | 10/07/2003 |
| 4100823 | Automatic transmission An automatic transmission for engine driven vehicles, in which there is a torque converter and a planetary gear system, and linkage means whereby the leverage between the fluid torque converter and the planetary system is controlled by a vacuum generated ... | 07/18/1978 |
| 3995424 | Fluid clutches The invention relates to a fluid clutch of the kind comprising cooperating vaned pump and turbine elements between which toroidal power-transmitting liquid vortices are established. At least part of the vanes of one of the elements is movable between clut... | 12/07/1976 |
| 3975906 | Twin flow modulated torque converter A twin-flow modulating torque converter having a torus which is defined by walls and rings of the pump, turbine and reactor members, and formed with a fluid bypass in the rings for developing an alternate flow circuit which bypasses the blades of one or m... | 08/24/1976 |