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| All Patents in class 55/485 | |||||
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| Number | Date | Patentee | Title | Type | |
| 814,698 | Mar. 13, 1906 | F.G. Hobart | Gas Purifier | gas cleaning apparatus | |
| 3,772,857 | Nov. 20, 1973 | G.H. Schultz, R.H. Jackson | Water Air Separator | separators | |