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| All Patents in class 338/78 | |||||
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| Number | Date | Patentee | Title | Type | |
| 575,366 | Jan. 19, 1897 | W.H. Morgan | Electrical Controller | motor controls | |
| 793,848 | Jul. 04, 1905 | C.S. Reno | Electric controller | elevators and lifts | |