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