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| All Patents in class 33/40 | |||||
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| Number | Date | Patentee | Title | Type | |
| 313,648 | Mar. 10, 1885 | R.W. Bentley | Ruling and Engraving Machine | metal engraving machines | |
| 363,942 | May 31, 1887 | F.L. Bailey | Engraver's Ruling Machine | metal engraving machines | |
| 969,496 | Sep. 06, 1910 | V. Royle | Ruling Machine | ruling machines | |
| 3,087,286 | Apr. 30, 1963 | F.G. Krafft | Feeding method and apparatus | grinders | |