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 |
| 6623057 | Uni-directional lockout for railroad car wheelset differential A railroad car wheelset has an axle with one wheel (14A) rigidly attached. This wheel is permitted to rotate by means of journal bearings either on the extreme ends of the axle or inboard of each wheel location. At the other wheel, the axle has smooth sur... | 09/23/2003 |
| 6007126 | Stationary, slow speed and uni-directional lockout for differential action railroad car wheelsets A railroad car wheelset has an axle with one wheel rigidly attached as in conventional railroad practice. This wheel is permitted to rotate by journal bearings. At the other wheel, the axle is provided with a smooth surface and a self-lubricating bearing ... | 12/28/1999 |
| 5564340 | Coke oven rail car with drive control system for positioning the car and door extractor which compensates for thermal distortion of oven jambs A coke oven door extractor is mounted on the rail car and includes door engaging supports movable in individually differing amounts relative to a plane parallel to and including the door jamb and a door jamb height axis of symmetry and movable vertically,... | 10/15/1996 |
| 5447106 | Coke oven rail car with drive control system for positioning the car having gross and fine positioning drinks A coke oven rail car with a drive control system for positioning the car and for spotting the functional equipment carried by the car. A sensor determines the relative position of the car with respect to a selected oven in a coke oven battery. The car inc... | 09/05/1995 |
| 4905605 | Conveyor trolley A conveyor trolley with a pair of wheels rolling on a flat upper face of an upper end rail portion of a guide rail, one wheel acting as a drive wheel and attached to an output shaft of a speed-reducing unit mounted on a trolley body movably supported on t... | 03/06/1990 |
| 4646648 | Carrier moving apparatus with variable ratio transmission An endless loop conveyor system is disclosed wherein a plurality of carriers are moved to one or more work stations and one or more buffer stations so that a product may be assembled on each carrier at the work stations. Power is extracted from a continuo... | 03/03/1987 |
| 4630544 | Actuating mechanism in overhead rail equipment The drive motor of a vehicle running on an overhead rail and being drivingly coupled thereto through a drive wheel is selectively connected to and disconnected from that wheel through a coupling mechanism which is constructed for obtaining coupling and di... | 12/23/1986 |
| 4067260 | Rack and pinion and adhesion drive locomotive Two sets of independently rotatable gear wheels are interconnected between the differential gear coupled to the motor and the two respective reduction drives coupled to the gear wheel rack and pinion drive and adhesion wheel drive. The sets of gear wheels... | 01/10/1978 |