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| All Patents in class 188/251A | |||||
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| Number | Date | Patentee | Title | Type | |
| 283,356 | Aug. 14, 1883 | W. Painter | Pulley Covering | industrial machine pulleys and belt drive mechanisms | |
| 403,739 | May 21, 1889 | H.C. Crowell | Friction Clutch | industrial machine clutches | |