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| All Patents in class 194/253 | |||||
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| Number | Date | Patentee | Title | Type | |
| 553,872 | Feb. 04, 1896 | A.H. Roovers, A.W. Roovers | Vending instrument | ||
| 687,168 | Nov. 19, 1901 | A.H. Roovers, A.W. Roovers | Coin controlled die press | patternmaker | |