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 |
| 4502356 | Parting sword on equipment for letting out hides A device is disclosed for letting out hides which comprises a table having a longitudinally extending slot therein for supporting a hide, clamping jaws movable laterally of the slot to clamp a fold in the hide, and a parting sword raisable into the slot t... | 03/05/1985 |
| 4474040 | Machine for chamfering pieces of hide, leather and synthetic materials of small thickness, particularly for shoe and leather factories The invention relates to a machine for chamfering pieces of hide, leather and synthetic materials of small thickness, in which all the operating machine members, and particularly the rotary cup-shaped blade, the feed roller for feeding the piece to be cha... | 10/02/1984 |
| 4338803 | Skiving machine for hides and similar materials The machine comprises a dished cutter rotary supported by a shaft connected to a driving shaft by means of a sliding coupling device comprising an extension of the shaft having a radial pin sliding in slots of a hollow shaft. A grinding wheel is supported... | 07/13/1982 |