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| All Patents in class 301/5.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 525,799 | Sep. 11, 1894 | G.W. Rymes | Device for balancing rotating parts | industrial machine mechanisms | |
| 2,216,308 | Oct. 01, 1940 | E.C. Ballman | Method and Means for Balancing Grinding Wheels | wheel truing devices | |
| 2,861,471 | Nov. 25, 1958 | M. Kronenberg | Balancing device | metal lathe accessories and attachments | |