| Patents for Ingersoll Rock Drill Co. |
Patents 1 -
6
of 6
      |
| Picture | Number | Date | Patentee | Title |
 | 11,787 | Oct. 10, 1854 | S. Ingersoll | Pawl Drill |
 | 112,254 | Feb. 28, 1871 | S. Ingersoll | Improvement in rock-drills |
 | 120,279 | Oct. 24, 1871 | S. Ingersoll | Improvement in rock-drills |
| | 147,402 | Feb. 10, 1874 | S. Ingersoll | Improvement in rock-drills |
 | 147,403 | Feb. 10, 1874 | G.R. Cullingworth, H.C. Sergeant, A.H. Elliott, S. Ingersoll | Improvement in steam-engines for rock-drills, &c. |
| | RE6,292 | Feb. 16, 1875 | S. Ingersoll | Improvement in machines for drilling rock |
