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| All Patents in class 15/311 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,770,935 | Jul. 22, 1930 | E. Lochman | Eraser-cleaning machine | ||
| 2,103,893 | Dec. 28, 1937 | E.E. Buskirk | Portable air purifier unit | dust collectors | |