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| All Patents in class 122/155.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 144,499 | Nov. 11, 1873 | A. Betts | Devices for Changing the Speed of Machinery | industrial machine speed and direction changing mechanisms | |
| 172,557 | Jan. 25, 1876 | F. Collignon | Steam Boiler | stationary boilers | |