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| All Patents in class 451/452 | |||||
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| Number | Date | Patentee | Title | Type | |
| 249,934 | Nov. 22, 1881 | C. Heaton | Safety-guard for emery-wheels | woodworking machine safety guards | |
| 2,565,658 | Aug. 28, 1951 | W.P. Hilger | Floor sanding edger | floor sanders | |
| 3,694,971 | Oct. 03, 1972 | J.A. Moores, H.W. Renner | Guard System for High Speed Grinder | grinders | |
| 3,902,286 | Sep. 02, 1975 | C.B. Matson | Grinding Wheel Guard with Energy Absorbing Apparatus | metalworking machine mechanisms | |