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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 |
| 5531029 | Do it yourself hem line marker with chalk A new and improved do it yourself hem line marker with chalk comprised of a base having a rounded top surface, and a hollow interior. A recess is formed in the rounded top surface. A sand mixture is positioned within the hollow interior. The sand mixture ... | 07/02/1996 |
