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| All Patents in class 55/433 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,923 | Feb. 09, 1886 | H. Hennig | Spark Arrester | locomotive exhausts | |
| 1,991,337 | Feb. 12, 1935 | J.C. Smith | Dust separating apparatus | ||
| 2,524,347 | Oct. 03, 1950 | H.L. Gilmore | Filter unit | dust collectors | |