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| All Patents in class 415/218.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,131,044 | Mar. 09, 1915 | A.L. De Leeuw | Pump | centrifugal pumps | |
| 2,480,807 | Aug. 30, 1949 | C.B. De Vlieg | Method and apparatus for making impeller wheels | milling machines | |