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| All Patents in class 415/177 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,186,589 | Jun. 13, 1916 | W.J. London | Turbine | ||
| 1,782,456 | Nov. 25, 1930 | G.A. Biggs | Turbine Regulating Device | ||
| 1,949,993 | Mar. 06, 1934 | J.Y. Dahlstrand | Unit Heater | ||