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| All Patents in class 451/398 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,893,676 | Jul. 08, 1975 | L.J. Gloshinski | Magnetic Chuck | magnetic chucks | |
| 4,987,701 | Jan. 29, 1991 | M.H. Humbert | Endless belt valve grinder | valve and seat maintenance | |
| 5,319,890 | Jun. 14, 1994 | J.G. Warner | Bushingless Workhead | metalworking machine mechanisms | |