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| All Patents in class 451/307 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,407,096 | Oct. 04, 1983 | C.I. Steinback | Method and apparatus for surface grinding | sanding machines | |
| 4,499,693 | Feb. 19, 1985 | M.J. Carroll, J.J. Fatula, Sr. | Method of grinding non-uniform workpieces | metal sanding machines | |
| 4,635,405 | Jan. 13, 1987 | L.E. Stump | Continuous arcuate feed assembly | metal sanding machines | |
| 4,987,701 | Jan. 29, 1991 | M.H. Humbert | Endless belt valve grinder | valve and seat maintenance | |