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| All Patents in class 55/337 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,316,836 | Apr. 20, 1943 | A.A. Breuer | Portable suction cleaner | vacuum cleaners | |
| 2,990,032 | Jun. 27, 1961 | R.L. Sandvig | Separator for use with rock drills | separators | |