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| All Patents in class 417/481 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,362,703 | Nov. 14, 1944 | J. Kuttner | Pump Impeller | rotary pumps | |
| 2,433,461 | Dec. 30, 1947 | J. Kuttner | Oscillating Pump Impeller | centrifugal pumps | |