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| Patents for Alfred Walter Roovers | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 449,749 | Apr. 07, 1891 | A.W. Roovers | Vending machine | |
 | 912,734 | Feb. 16, 1909 | A.W. Roovers | Coin controlled electrical apparatus | |
 | 1,163,464 | Dec. 07, 1915 | A.W. Roovers | Gage for positioning | |