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| All Patents in class 178/2R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,647 | Jun. 20, 1840 | S.F. Morse | Electric telegraph | |
 | RE79 | Jan. 15, 1846 | S.F. Morse | Improvement in the mode of communicating information by signals by the application of electro-magnetism | |
| 306,325 | Oct. 07, 1884 | W.H. Doane | Planer pressure-roll | ||