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| All Patents in class 210/402 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,541,202 | Feb. 13, 1951 | H.J. Caldwell | Apparatus for removing entrained particles from liquid coolant | ||
| 2,564,593 | Aug. 14, 1951 | H.J. Caldwell | Magnetic separator | ||