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| All Patents in class 15/310 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,792,570 | Feb. 17, 1931 | A.A. Breuer | Blackboard-eraser cleaner | ||
| 2,475,815 | Jul. 12, 1949 | G.C. Burd | Vacuum cleaning device | dust collectors | |