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| All Patents in class 91/453 | |||||
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| Number | Date | Patentee | Title | Type | |
| 711,239 | Oct. 14, 1902 | E.B. Tree | Rotary Engine | ||
| 2,535,957 | Dec. 26, 1950 | E.G. Roehm, M. Romaine | Precision Positioning Mechanism | metalworking machine mechanisms | |
| 2,537,391 | Jan. 09, 1951 | H.F. Bakewell | Hydraulic ram device with intermittent high-pressure fluid supply | stamping presses | |
| 2,660,985 | Dec. 01, 1953 | H. Ernst | Hydraulic Feed System | hydraulic apparatus | |
| 2,669,982 | Feb. 23, 1954 | C.H. Schowalter | Ambient Air Control of Blower By-Passes | fuel systems | |