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| All Patents in class 187/311 | |||||
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| Number | Date | Patentee | Title | Type | |
| 349,177 | Sep. 14, 1886 | C.K. Rogers | Elevator | elevators and lifts | |
| 450,965 | Apr. 21, 1891 | E.S. Matthews | Elevator-valve controller | ||
| 469,655 | Feb. 23, 1892 | E.S. Matthews | Elevator-controller | ||
| 472,930 | Apr. 12, 1892 | E.S. Matthews | Controller for elevators | ||
| 481,580 | Aug. 30, 1892 | E.S. Matthews | Elevator-controlling mechanism | ||