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| All Patents in class 29/890.051 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 20,851 | Jul. 06, 1858 | J. Lowe | Steam Pressure Gage | ||
| 1,468,692 | Sep. 25, 1923 | J.F. Baker | Method of making boiler headers | ||
| 2,160,393 | May 30, 1939 | G.M. Trefts, III | Pressure Vessel of the Boiler Type and Method for Producing Same | ||