William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 6290079 | Coupler for railroad cars An apparatus is provided for connecting electric and air lines of railroad cars incident to their mechanical coupling. The connector includes a junction plate with an outer perimeter surrounded by a housing that has connector-to-connector gathering means ... | 09/18/2001 |
| 6173849 | Termination of power and communications trainline of electro-pneumatic brakes A leading end termination connector on each locomotive and an EP line termination circuit in the leading end termination connector. The leading end connector of a locomotive not connected to an adjacent locomotive is connected to the leading end terminati... | 01/16/2001 |
| 5455465 | Rapid transit car electrical coupling apparatus and method A train car with mirror image electrical couplings having mirror image halves at each end for connecting train lines in each car to corresponding train lines in adjacent cars, regardless of the end-to-end orientation of the car, has selected pairs of trai... | 10/03/1995 |
| 5139158 | Coupling and uncoupling device for an electrical cable coupling and a mechanical middle buffer coupling for rail-borne vehicles, as well as a switching device for actuating the coupling and uncoupling device for coupling and uncoupling To couple the initiation and the chronological sequence of a coupling or uncoupling process of a mechanical middle buffer coupling and an electrical cable coupling with a common rotary drive with the smallest amount of control effort possible in a reliabl... | 08/18/1992 |
| 4892204 | Automatic coupler control system Coupler control system for railway vehicles that provides isolation of the electric and pneumatic lines of a rail vehicle from its corresponding electric and/or pneumatic intervehicle interface when that end of the vehicle is in an uncoupled condition. A ... | 01/09/1990 |
| 4049128 | Control system for automatic railway car coupler An electro-pneumatic control system for effecting coupling and uncoupling action of automatic rapid transit type car couplers in a manner which assures that fluid pressure lines are cut off and that electrical contacts are disconnected before actual physi... | 09/20/1977 |