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| All Patents in class 451/457 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,372,033 | Mar. 22, 1921 | W.A. Marschke, F.W. Marschke | Grinder-hood | ||
| 1,406,914 | Feb. 14, 1922 | V.A. Virgilio | Adjustable safety guard for emery wheels | grinders | |
| 1,539,829 | Jun. 02, 1925 | F.L. Cole | Guard and work-rest mounting | ||