| Patents for Duff Mfg. Co. |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 1,052,921 | Feb. 11, 1913 | I.E. Hindman | Lifting-jack |
 | 1,054,413 | Feb. 25, 1913 | I.E. Hindman | Lifting-jack |
 | 1,089,703 | Mar. 10, 1914 | I.E. Hindman | Friction clutch for screw-jacks |
 | 1,089,704 | Mar. 10, 1914 | I.E. Hindman | Rail-fastening |
 | 1,093,269 | Apr. 14, 1914 | I.E. Hindman | Jack |
 | 1,107,611 | Aug. 18, 1914 | I.E. Hindman | Lever-socket for lifting-jacks |
 | 1,147,476 | Jul. 20, 1915 | W.M. Alston, I.E. Hindman | Lifting-jack |
 | 1,151,232 | Aug. 24, 1915 | W.M. Alston, I.E. Hindman | Lifting-jack |
 | 1,165,380 | Dec. 28, 1915 | I.E. Hindman, W.M. Alston | Lifting-jack |
 | 1,228,210 | May 29, 1917 | I.E. Hindman | Screw-jack |
