Amusement Machines: U (type: Trade Stim.)
| Name | Manufacturer | Year | Type | Genre | Description | Images |
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| Ultra Modern Daval Gum Vender Jackpot | Daval Manufacturing Co. | 1933 | Trade Stim. / Reel |
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| Umpire | Mills Novelty Co. | 1905 | Trade Stim. / Reel |
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| Union | D. N. Schall & Co. | Trade Stim. / Wheel |
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| Universal Automatic Race Track | Chicago Nickel Works | 1889 | Trade Stim. / Racing |
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| Unknown Penny Drop Fortune Machine | Unknown | 1910 | Trade Stim. / Coin drop |
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| Upright Card Machine | Mills Novelty Co. | 1901 | Trade Stim. / Card game |
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| Upright Perfection | Mills Novelty Co. | 1901 | Trade Stim. / Card game |
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