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 |
| 4890939 | Device for mounting the cam shaft for actuating the brake shoes of a drum brake for vehicles and the like A device for mounting a cam shaft for actuating the brake shoes of a drum brake for vehicles and the like, in which the cam shaft is mounted in a bearing eye of the brake bracket via a bearing section by a bushing, includes a tigthening disk and a guard r... | 01/02/1990 |
| 4494290 | Split bushing and tool kit A cut or split bushing having a set of holes or apertures along one or both sides of the bushing for receiving pinching finger elements of a tool. By this structure, one is capable of grasping the bushing at its apertures for axial insertion into or axial... | 01/22/1985 |