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 |
| 6241025 | Aerator A lawn aerator that is attachable to a piece of mechanized lawn care equipment, such as a self-propelled lawn mower, lawn tractor and the like, for aerating a lawn. The lawn aerator includes a frame having first and second opposite ends, with the frame in... | 06/05/2001 |