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| All Patents in class 210/254 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,482,302 | Sep. 20, 1949 | O.M. Summers | Filtering System | coolant apparatus | |
| 2,518,835 | Aug. 15, 1950 | O.M. Summers | Filter system | coolant apparatus | |