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| All Patents in class 55/406 | |||||
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| Number | Date | Patentee | Title | Type | |
| 294,248 | Feb. 26, 1884 | J.M. McIntyre | Method of and apparatus for separating dust from air | waste collection mechanisms | |
| 1,991,337 | Feb. 12, 1935 | J.C. Smith | Dust separating apparatus | ||
| 2,289,474 | Jul. 14, 1942 | E.L. Anderson | Apparatus for dust collection | waste collection mechanisms | |