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| All Patents in class 415/21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,897,834 | Feb. 14, 1933 | G.A. Biggs | Hydraulic Turbine | turbine water wheels | |
| 1,950,773 | Mar. 13, 1934 | G.A. Biggs | Hydraulic Turbine | turbine water wheels | |