Amusement Machines: U (type: Slot Machine)
| Name | Manufacturer | Year | Type | Genre | Description | Images |
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| Uncle Sam | Paupa & Hochriem Co. | 1899 | Slot Machine / Wheel |
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| Unic | Unic Stella | Slot Machine / Wall game |
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| Unic | Unic Stella | 1895 | Slot Machine / Coin drop |
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| Unknown Slot | Unknown | Slot Machine |
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| Unknown Slot | Unknown | Slot Machine |
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| Uno | Paul E. Berger Manufacturing Co. | 1900 | Slot Machine / Upright |
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