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| All Patents in class 346/144 | |||||
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| Number | Date | Patentee | Title | Type | |
| 912,312 | Feb. 16, 1909 | F. Hardinge | Receptacle for keys for watchmen's clock | ||
| 986,630 | Mar. 14, 1911 | F. Hardinge | Watchman's clock | ||
| 1,042,385 | Oct. 29, 1912 | A.C. Bell | Signalling system | ||
| 1,188,349 | Jun. 20, 1916 | F. Hardinge | Key for watchmen's clocks | ||