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| All Patents in class 432/194 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 29,671 | Aug. 21, 1860 | W. Clemson | Tempering Saws | |
 | 65,946 | Jun. 18, 1867 | C. Richardson | Improved Apparatus for Tempering Steel Plates | |
 | 169,736 | Nov. 09, 1875 | G.F. Simonds | Improvement in Tempering and Forming Articles of Steel | |