| Patents for Irwin Auger Bit Co. |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 306,907 | Oct. 21, 1884 | W.M. Dimitt | Auger Bit | drill bits |
| 361,522 | Apr. 19, 1887 | C.H. Irwin | Auger Bit | drill bits |
| 378,251 | Feb. 21, 1888 | C.H. Irwin | Die for Making Auger-Bits | making drills and augers |
| 1,622,209 | Mar. 22, 1927 | C.B. Robinson | Boring and Reaming Tool | tapered reamers |
| 2,029,447 | Feb. 04, 1936 | H.M. Swain | Auger Bit | auger bits |
| 2,193,917 | Mar. 19, 1940 | A.P. Albrecht, A.R. Bone | Bit Extension | drill bit extensions |
| 2,215,344 | Sep. 17, 1940 | A.P. Albrecht | Micro Dial | drill bits |
| 2,589,500 | Mar. 18, 1952 | J.R. Thomson, R.K. Landon | Strait-Line | plumb bobs |
