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| All Patents in class 451/214 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,754,631 | Jul. 17, 1956 | B.B. Stockard, Jr. | Knife grinder | cutter grinding | |
| 2,812,621 | Nov. 12, 1957 | R.C. Evans, W.J. Blazek, C.R. Barkley | Apparatus for automatically forming and finishing grooves in workpieces | sharpening machines | |