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| All Patents in class 91/421 | |||||
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| Number | Date | Patentee | Title | Type | |
| 453,247 | Jun. 02, 1891 | S. Smith | Rotary Steam Engine | rotary steam engines | |
| 1,884,277 | Oct. 25, 1932 | B. Sassen | Self Regulating Hydraulic System | hydraulic apparatus | |
| 2,028,766 | Jan. 28, 1936 | L.F. Nenninger, H. Ernst | Uniform Feed System | hydraulic apparatus | |
| 2,444,474 | Jul. 06, 1948 | B.R. Purvin | Fluid pressure device | ||
| 2,775,235 | Dec. 25, 1956 | W.F. Jessup | Booster for Template Controlled Truing Mechanism | grinder dressers | |