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| All Patents in class 266/260 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 153,115 | Jul. 14, 1874 | I.J. Robinson | Improvement in processes for tempering the blades of squares | |
| 2,309,518 | Jan. 26, 1943 | J.M. Luers | Quenching and Straightening Tool | ||