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| All Patents in class 137/331 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,103 | Jul. 06, 1852 | E. Rogers | Mode of Grinding Puppet-Valves While the Engine is in Motion | steam engine valves | |
| 1,470,974 | Oct. 16, 1923 | F. Hardinge | Valve | industrial furnaces | |
| 1,546,580 | Jul. 21, 1925 | F. Hardinge | Valve | industrial furnaces | |
| 1,619,470 | Mar. 01, 1927 | F. Hardinge | Oil burning mechanism | industrial furnaces | |