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| All Patents in class 55/300 | |||||
| Number | Date | Patentee | Title | Type | |
| 531,517 | Dec. 25, 1894 | E.R. Draver | Dust-collector | ||
| 2,368,343 | Jan. 30, 1945 | E.E. Buskirk | Air purifier | dust collectors | |
| 2,620,066 | Dec. 02, 1952 | H.L. Gilmore | Air cleaner | dust collectors | |