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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| Application No. | Application Title | Issue Date |
| 20110215968 | SYSTEM AND METHOD OF GENERATING A RADIO FREQUENCY SIGNAL A system and method of generating a radio frequency signal adapted for allowing a receiving device to calculate a navigational indicator relative to a plurality of antennas. The system comprising a radio frequency generator unit for generating: a primary signal for driv... | 09/08/2011 |