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| All Patents in class 74/570.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 103,698 | May 31, 1870 | D.A. Woodbury | Reversing and Cut-Off Apparatus for Steam Engines | steam engine valve gear | |
| 3,866,489 | Feb. 18, 1975 | R.J. Kimmelaar | Dynamic Balancing Apparatus | centerless grinders | |