| All Patents in class 148/588 |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
 | 52,450 | Feb. 06, 1866 | J. Russell | Process of Hardening Files |
 | 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 |
 | 140,390 | Jul. 01, 1873 | L.W. Stuart | Improvement in Process of Hardening Edge Tools |
 | RE7,464 | Jan. 16, 1877 | G.F. Simonds | Improvement in Tempering and Forming Article of Steel |
 | RE7,465 | Jan. 16, 1877 | G.F. Simonds | Improvement in Tempering and Forming Article of Steel |
| | 237,915 | Feb. 15, 1881 | G.F. Simonds | Methd of correcting unequal tension in circular saws |
 | 324,600 | Aug. 18, 1885 | C.T. Shoemaker | Manufacture of Saws |
 | 1,265,944 | May 14, 1918 | C. Napier | Process of and Apparatus for Heat Treatment of Metal Objects |
 | 1,333,767 | Mar. 16, 1920 | C. Napier | Method of making tempered blades |
