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 |
| 6163238 | Fast variable RF network inductor A variable RF inductor network having a plurality of coaxial cables with their respective outer conductors in electrical contact with each other, thereby forming a common outer conductor. This common outer conductor is connected to an RF ground and an RF ... | 12/19/2000 |
| 4265128 | Turret type frequency selector A frequency selector (tuner) employs a turret to select the position of a slide member that is coupled to a variable reactance. The slide member is moved away from the turret by depressing an operating member and returns to the turret when the operating m... | 05/05/1981 |