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| All Patents in class 175/426 | |||||
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| Number | Date | Patentee | Title | Type | |
| 224,530 | Feb. 17, 1880 | W. Hasenzahl | Boring Tool for Stone Working | stoneworking | |
| 2,969,122 | Jan. 24, 1961 | M.J. Steffes | Masonry drill | ||
| 2,969,846 | Jan. 31, 1961 | R.L. Sandvig | Percussive drill bit for use in reverse flow flushing is soft rock drilling | ||