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| All Patents in class 451/319 | |||||
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| Number | Date | Patentee | Title | Type | |
| 692,129 | Jan. 28, 1902 | G.W. Nimon, D.R. Ferguson | Roll Polishing Apparatus | polishing machines | |
| 1,236,408 | Aug. 14, 1917 | E.J. Dickson | Valve Reamer and Refacer | valve grinding tools | |
| 2,601,630 | Jun. 24, 1952 | R.J. Rahn, I.J. Rahn | Angle block and method of manufacture | measuring tools | |