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| All Patents in class 55/436 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,402,147 | Jan. 03, 1922 | A.A. Day | Air washer and the like | ||
| 1,847,452 | Mar. 01, 1932 | H.P. Vaughan | Air Cleaner | ||
| 2,813,597 | Nov. 19, 1957 | M.W. First | Multi-dust collectors | ||