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| All Patents in class 409/142 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,822,618 | Jul. 09, 1974 | A.A. Tomenceak | Contour Machining | milling machine cutters | |
| 3,902,278 | Sep. 02, 1975 | R.E. Crossman, H.R. Uhtenwoldt | Grinding Machine for Generating an Epitrochoidal Surface | profile and contour grinders | |