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| All Patents in class 451/919 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,494,388 | Feb. 10, 1970 | L.C. Jenkins, V.O. Sanders | Turning and Boring Head | vertical boring mills | |
| 3,902,278 | Sep. 02, 1975 | R.E. Crossman, H.R. Uhtenwoldt | Grinding Machine for Generating an Epitrochoidal Surface | profile and contour grinders | |