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| All Patents in class 122/441 | |||||
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| Number | Date | Patentee | Title | Type | |
| 115,928 | Jun. 13, 1871 | G. Bradford | Improvement in Steam Engines | steam engines | |
| 162,120 | Apr. 13, 1875 | J.E. Taylor | Steam Engine Cylinder | steam engine cylinders | |
| 641,762 | Jan. 23, 1900 | H.C. Clay | Compound Engine | steam engines | |