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| All Patents in class 175/403 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 224,530 | Feb. 17, 1880 | W. Hasenzahl | Boring Tool for Stone Working | ||
 | 632,764 | Sep. 12, 1899 | J. Stephens | Hollow auger | |
| 816,236 | Mar. 27, 1906 | R.D. Kline | Transplanting Device | ||
| 2,919,902 | Jan. 05, 1960 | M.J. Steffes | Masonry drill | ||
| 2,969,122 | Jan. 24, 1961 | M.J. Steffes | Masonry drill | ||