| All Patents in class 451/21 |
Patents 16 -
22
of 22
      |
| Number | Date | Patentee | Title | Type |
| 3,222,823 | Dec. 14, 1965 | W.B. Seidel | Grinding Machine Truing Compensating Mechanism | grinder dressers |
| 3,867,794 | Feb. 25, 1975 | E.G. Robillard | Grinding Machine | internal grinders |
| 3,913,277 | Oct. 21, 1975 | R.P. Lindsay, R.S. Hahn | Grinding Machine | grinding machines |
| 3,938,492 | Feb. 17, 1976 | N.J. Mercer, Jr. | Over the Wheel Dresser | grinder dressers |
| 4,471,580 | Sep. 18, 1984 | E.G. Robillard | Wheel Wear Compensation Control for Grinding Machine Feed Cycle | grinding machines |
| 4,528,776 | Jul. 16, 1985 | M.R. Estabrook | Honing machine with stonewear compensator | honing machines |
| 4,676,030 | Jun. 30, 1987 | H.W. Lawson, Jr. | Apparatus and Method for Detecting a Tool Edge | electronic gauges |
