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| All Patents in class 55/472 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,001,121 | May 14, 1935 | A.A. Breuer | Portable suction cleaner | dust collectors | |
| 2,475,815 | Jul. 12, 1949 | G.C. Burd | Vacuum cleaning device | dust collectors | |