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| All Patents in class 248/638 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,998,867 | Sep. 05, 1961 | A.H. Dall | Vibration Damper | ||
 | 5,033,340 | Jul. 23, 1991 | L.T. Siefring | Apparatus and method for tool vibration damping | |