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 |
| 7197864 | Transport arrangement for an agricultural machine having a detachable front attachment An agricultural machine, such as a self-propelled harvester, includes an attachment that is removably mounted to the machine. A transport device is adapted to be removably mounted onto the attachment to support the attachment during road transport of the machine. A ... | 04/03/2007 |
| 7108075 | Seedbed preparation implement having rotary disc with adjustable gang angle A disc gang is provided that is suitable for use as part of a multifunctional seedbed preparation implement or in a standalone disc harrow. The disc gang is configured to permit a gang angle of the disc gang to be adjusted to accommodate differing soil conditions an... | 09/19/2006 |
| 5590721 | Conservation tillage tool A conservation tillage tool, including a main frame and a rear frame pivotally mounted on the main frame disposed to support a number of soil working implements in sequence. The main frame is supported by ground wheels attached to the rear section of the ... | 01/07/1997 |
| 5289880 | Towable road tender A towable road tender device for grading unpaved roadway surfaces. The tender device may be hitched to commercial vehicles but is particularly suited for use with private vehicles, such as small tractors and pickup trucks. A set of relatively lightweight ... | 03/01/1994 |
| 4702489 | Apparatus for lifting an end of a hitch The present invention is directed to an apparatus for engaging and lifting the end of a hitch resting on the ground. The apparatus is particularly useful when attached to a yard tractor used for moving trailers or trailer dollys about a parking yard. The ... | 10/27/1987 |