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| All Patents in class 251/324 | |||||
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| Number | Date | Patentee | Title | Type | |
| 70,784 | Nov. 12, 1867 | E.H. Bellows | Improvement in Slide Valves | steam engine valves | |
| 1,580,094 | Apr. 06, 1926 | A. White | Tool-operating machine | mortising machines | |
| 2,145,977 | Feb. 07, 1939 | B.N. Foster | Solenoid actuated valve | metalworking machine mechanisms | |
| 2,237,114 | Apr. 01, 1941 | E.C. Read | Valve | steam engines | |
| 2,686,650 | Aug. 17, 1954 | W.I. Evans | Hydraulic Tracing Mechanism | profiling machines | |