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 |
| 4932808 | Assembly of prefabricated structural components for lattices or trusses An assembly of prefabricated structural components for lattices or trusses includes a plurality of rod-like, load-bearing elements, a plurality of joining elements for joining the rod-like elements to one another, a plurality of connecting elements for co... | 06/12/1990 |