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| All Patents in class 55/325 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,430,448 | Nov. 11, 1947 | R. Breckheimer | Dust collector | waste collection mechanisms | |
| 2,990,032 | Jun. 27, 1961 | R.L. Sandvig | Separator for use with rock drills | separators | |