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| All Patents in class 15/308 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,581,774 | Apr. 20, 1926 | E.W. Zeh | Tile cleaning and stacking machine and method | brick and tile making machines | |
| 1,792,570 | Feb. 17, 1931 | A.A. Breuer | Blackboard-eraser cleaner | ||
| 1,945,274 | Jan. 30, 1934 | A. Hormel | Metal plate cleaning machine | ||