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| All Patents in class 346/56 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,152,804 | Sep. 07, 1915 | G.W. Freeland | Recording mechanism | locomotive coal feeding apparatus | |
| 1,223,581 | Apr. 24, 1917 | F. Hardinge | Watchman's clock | ||