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| All Patents in class 148/647 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 67,734 | Aug. 13, 1867 | H. Disston | Improvement in Hardening and Straightening Steel Blades | |
 | 86,286 | Jan. 26, 1869 | H. Disston | Improvement in Device for Simultaneously Hardening and Straightening Circular-Saw Blades | |
 | 153,115 | Jul. 14, 1874 | I.J. Robinson | Improvement in processes for tempering the blades of squares | |