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| All Patents in class 148/644 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 41,464 | Feb. 02, 1864 | F.F. Smith | Improvement in Cooling and Tempering Cast Steel Plow Plates | |
 | 153,115 | Jul. 14, 1874 | I.J. Robinson | Improvement in processes for tempering the blades of squares | |
| 2,614,441 | Oct. 21, 1952 | E.A. Goddard | Cutter and method of forming the same | ||