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| All Patents in class 474/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 591,500 | Oct. 12, 1897 | F. Scheben | Device for Preventing Slipping of Belts | industrial machine pulleys and belt drive mechanisms | |
| 1,496,032 | Jun. 03, 1924 | F.H. Sleeper | Pulley | friction clutches | |