| Patents for Halladay, Litchfield & Co. |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 172,092 | Jan. 11, 1876 | W.L. Covel | Improvement in saw-sharpening machines | saw sharpening machines |
| 222,386 | Dec. 09, 1879 | W.L. Covel | Improvement in saw-sharpening machines | saw sharpening machines |
| 254,869 | Mar. 14, 1882 | W.H. Halladay | Saw-sharpening machine | saw sharpening machines |
| CA-15,491 | Sep. 19, 1882 | W.H. Halladay | Improvements on automatic saw-sharpeners | saw sharpening machines |
| RE10,252 | Dec. 05, 1882 | W.L. Covel | Saw-sharpening | saw sharpening machines |
