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| All Patents in class 82/904 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,903,916 | Sep. 15, 1959 | C.R. Leonard | Apparatus for preventing vibration of boring bars | boring and turning machines | |
| 3,230,831 | Jan. 25, 1966 | R.J. Harker | Vibration Damper for Machine Tools | horizontal boring mill attachments | |