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| All Patents in class 451/117 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,877,348 | Sep. 13, 1932 | E.H. Peterson, N.F. McNaught | Valve grinder | ||
| 1,918,743 | Jul. 18, 1933 | F.P. Tandy, R.C. Murphy, F.H. Etzenhouser | Valve Grinder | valve grinding tools | |
| 1,952,087 | Mar. 27, 1934 | N.F. McNaught, E.H. Peterson | Valve guide and unseater | ||
| 1,971,289 | Aug. 21, 1934 | E.C. Swanson, J.H. Abramson | Ratcheting Screwdriver | spiral screwdrivers | |