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| All Patents in class 251/294 | |||||
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| Number | Date | Patentee | Title | Type | |
| 854,418 | May 21, 1907 | S.S. Hall | Engine-governor | steam engine governors | |
| 1,267,130 | May 21, 1918 | W.B. Burrows, I.L. Skeith | Power Lifting Mechanism for Saw Trimmers | circular saw accessories | |
| 1,594,052 | Jul. 27, 1926 | E.R. Draver | Exhaust cut-out | ||
| 2,520,386 | Aug. 29, 1950 | E.J. Dillman | Refrigeration Expansion Valve | refrigeration apparatus | |
| 2,827,259 | Mar. 18, 1958 | E.T. Kindt | Automatic gate for dust collection system | waste collection mechanisms | |