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 |
| 4647235 | Thermal printing cassette mountable in a thermal printer A thermal printing cassette includes a body with a path for a strip of labels through it. A thermal printing head in the body operates against a platen to print the labels fed therepast. A feed roller moves the label strip past the platen. The labels are ... | 03/03/1987 |