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| All Patents in class 346/137 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,016,688 | Feb. 06, 1912 | F. Hardinge | Watchman's clock | ||
| 2,270,975 | Jan. 27, 1942 | N.J. Smith | Chart Holding Device | industrial recording apparatus | |