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| All Patents in class 74/524 | |||||
| Number | Date | Patentee | Title | Type | |
| 812,198 | Feb. 13, 1906 | J. Gessert | Bit-brace (engineer's) | ||
| 1,922,202 | Aug. 15, 1933 | W.E. Heuer, E.A. Hall | Cylinder Working Tool | honing tools | |
| 5,335,586 | Aug. 09, 1994 | R.J. Mathieu, J.A. Batten, M.R. Casto | Handle Linkage | tool handles | |