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| All Patents in class 403/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI107 | Jan. 03, 1854 | E.L. Freeman | Cultivator | cultivators and tillers | |
| 673,017 | Apr. 30, 1901 | . | Box Scraper with Adjustable Head | scrapers | |
| 1,712,087 | May 07, 1929 | L.T. Medholdt | Cutter head | cutterheads | |
| 1,906,902 | May 02, 1933 | V.S. Firestone, F. Sward | Brush holder | ||
| 3,572,197 | Mar. 23, 1971 | R.M. Ortlieb | Adjustable Toolholder | drilling and boring tool holders | |