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| All Patents in class 55/427 | |||||
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| Number | Date | Patentee | Title | Type | |
| 400,391 | Mar. 26, 1889 | E. Bretney | Dust-collector | waste collection mechanisms | |
| 405,869 | Jun. 25, 1889 | E. Bretney | Dust-collector | waste collection mechanisms | |
| 446,507 | Feb. 17, 1891 | E. Bretney | Dust-collector | waste collection mechanisms | |
| 458,550 | Aug. 25, 1891 | O. Kutsche | Process of and apparatus for separating dust from air | waste collection mechanisms | |