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| All Patents in class 188/218R | |||||
| Number | Date | Patentee | Title | Type | |
| 526,007 | Sep. 11, 1894 | H. Bolthoff | Hoisting-drum | industrial elevators and lifts | |
| 829,594 | Aug. 28, 1906 | H.F. Massey | Drop hammer or stamp | drop hammers | |
| 1,385,396 | Jul. 26, 1921 | E.E. Rayburn | Pulley | woodworking power transmission | |