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| All Patents in class 74/838 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 7,529 | Jul. 30, 1850 | G.B. Milner | Steam Engine Valve Gear | ||
 | 7,964 | Mar. 04, 1851 | H. Waterman | Variable Cut-Off Regulated by the Governor | |
 | 164,736 | Jun. 22, 1875 | J.L. Hewes | Improvement in valve-gears for steam-engines | |
| 302,835 | Jul. 29, 1884 | H.F. Frisbie | Valve Gear for Puppet Valve Engines | ||
| 1,862,132 | Jun. 07, 1932 | E.T. Adams | Injection Pump | ||
| 2,444,159 | Jun. 29, 1948 | L.E. Godfriaux | Fluid Pump | ||