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| All Patents in class 251/335.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 830,635 | Sep. 11, 1906 | L.R. Barker | Lathe Tool Holder and Steady Rest | lathe tool holders and tool posts | |
| 2,014,541 | Sep. 17, 1935 | F.W. Wappat | Pressure regulating valve | steam valves | |
| 2,192,117 | Feb. 27, 1940 | D.D. Wile | Control Device | temperature controls | |