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| All Patents in class 474/93 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,385,396 | Jul. 26, 1921 | E.E. Rayburn | Pulley | woodworking power transmission | |
| 1,388,865 | Aug. 30, 1921 | A. Kimble | Ventilated pulley | industrial machine pulleys and belt drive mechanisms | |
| 1,437,595 | Dec. 05, 1922 | A. Kimble | Water-cooled pulleys | industrial machine pulleys and belt drive mechanisms | |