| All Patents in class 148/645 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 67,734 | Aug. 13, 1867 | H. Disston | Improvement in Hardening and Straightening Steel Blades | tool making machines |
| 86,286 | Jan. 26, 1869 | H. Disston | Improvement in Device for Simultaneously Hardening and Straightening Circular-Saw Blades | tool making machines |
| 88,585 | Apr. 06, 1869 | G.H. Porter | Improved Process of hardening Steel | |
| RE7,464 | Jan. 16, 1877 | G.F. Simonds | Improvement in Tempering and Forming Article of Steel | tool making machines |
| RE7,465 | Jan. 16, 1877 | G.F. Simonds | Improvement in Tempering and Forming Article of Steel | tool making machines |
| 2,867,556 | Jan. 06, 1959 | G.E. Tegen | Method of Flame Hardening | heat treating machines |
