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| All Patents in class 408/213 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,025,109 | Apr. 30, 1912 | G.P. Butler | Auger-Bit | auger bits | |
| 1,056,670 | Mar. 18, 1913 | L.S. Hayden | Expansion Bit | drill bits | |
| 1,063,074 | May 27, 1913 | J.B. Shirer | Reamer | tapered reamers | |
| 1,275,889 | Aug. 13, 1918 | E.J. Flander | Bit With Detachable/Interchangable Cutters | adjustable drill bits | |
| 2,182,478 | Dec. 05, 1939 | R.G. Jacobson | Boring Head | boring heads | |
| 2,358,077 | Sep. 12, 1944 | A.C. Koett | Auger bit | auger bits | |