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 |
| 4171713 | Abutment mechanism for a moveable drive member of a weaving machine The abutment mechanism provides a resilient damping stop to dampen the initial stopping motion of a moveable drive member of a weft thread return mechanism or weft thread mixer changer as well as a rigid stop to stop movement of the drive member. The mech... | 10/23/1979 |