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| All Patents in class 187/270 | |||||
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| Number | Date | Patentee | Title | Type | |
| 43,451 | Jul. 05, 1864 | S. Van Emon, J. Reynolds, J.T. Bodley | Improvement in hoisting apparatus | hoists, winches, come-alongs | |
| 113,585 | Apr. 11, 1871 | T. Silver | Improvement in hoisting apparatus | hoists, winches, come-alongs | |
| 3,039,766 | Jun. 19, 1962 | C.N. Aronson | Geared elevation work positioner | work holding | |