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| All Patents in class 92/175 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 220,160 | Sep. 30, 1879 | W.J. Liddell | Improvement in Compound Engines | |
| 305,467 | Sep. 23, 1884 | P. Murray, Jr. | Gas Engine | ||
 | 2,138,644 | Nov. 29, 1938 | E.C. Read | Piston structure for uniflow steam engines | |
 | 2,193,983 | Mar. 19, 1940 | E.C. Read | Means for and method of facilitating alignment or centering of piston rod, piston, and cylinder assemblies | |