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| All Patents in class 415/28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,765,490 | Jun. 24, 1930 | J.T. Janette | Circulating apparatus | water heaters | |
| 2,455,552 | Dec. 07, 1948 | C.D. Bower | Turbine Pump | rotary pumps | |