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| All Patents in class 55/484 | |||||
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| Number | Date | Patentee | Title | Type | |
| 814,698 | Mar. 13, 1906 | F.G. Hobart | Gas Purifier | gas cleaning apparatus | |
| 2,103,893 | Dec. 28, 1937 | E.E. Buskirk | Portable air purifier unit | dust collectors | |