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| All Patents in class 123/573 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,847,452 | Mar. 01, 1932 | H.P. Vaughan | Air Cleaner | air supply apparatus | |
| 2,113,447 | Apr. 05, 1938 | F. Hardinge | Water separator for fluid lines | separators | |