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| Patents for Alfred Walter Roovers | |||||
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| Number | Date | Patentee | Title | Type | |
| 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 | ||