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| All Patents in class 277/377 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,114,238 | Oct. 20, 1914 | W.A. Doble | Adjustable Wear Ring | ||
 | 1,213,167 | Jan. 23, 1917 | A.M. Drake | Magnetic chuck and casing | |