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| All Patents in class 417/406 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,496,005 | Jun. 03, 1924 | H.B. Lee | Apparatus for controlling boiler water feed | feedwater apparatus | |
| 2,131,611 | Sep. 27, 1938 | G.A. Biggs | Turbine Pump | turbine water wheels | |