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| All Patents in class 416/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,962,380 | Jun. 12, 1934 | G.A. Biggs | Hydraulic Turbine | turbine water wheels | |
| 2,307,622 | Jan. 05, 1943 | H.N. Edens, C.B. Molter | Windmill | wind power apparatus | |