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 |
| 6070403 | Method and apparatus for fine adjustment of moving part sequences in balers Method and apparatus for fine-adjustment of moving part sequences in big square balers and, in particular, for adjusting the insertion point of the needle bar and the timing of the feeding mechanism for the baling material. The fine-adjustment is accompli... | 06/06/2000 |
| 4951452 | Large bale hay baler A hay baler including a trailer frame with a hitch for attachment to a prime mover and support wheels. A crop pick-up unit moves cut crop into a material storage area, from where it is moved into a bale chamber and is compacted by a compression unit and t... | 08/28/1990 |