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| All Patents in class 138/45 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,950,774 | Mar. 13, 1934 | G.A. Biggs | Hydraulic Turbine | turbine water wheels | |
| 2,151,656 | Mar. 21, 1939 | B.E. Folke | Choke Fitting for Steam Heat Pipes | feedwater apparatus | |