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| All Patents in class 417/191 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 677,866 | Jul. 09, 1901 | W.T. Harris | Apparatus for Returning Exhaust Steam to Steam Boilers | ||
| 1,109,682 | Sep. 08, 1914 | L. Kassander | Jet Pump Apparatus | ||
| 1,596,523 | Aug. 17, 1926 | L. Friedmann | Exhaust Steam Injector | ||
 | 2,625,797 | Jan. 20, 1953 | J.H. Shaver, H.H. Poort | Hydraulic eductor valve | |
 | 4,120,616 | Oct. 17, 1978 | J.A. Rasins, N.M. Dwyer | Vacuum cleaner-blower assembly with sound absorbing arrangement | |