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| All Patents in class 26/28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 415,243 | Nov. 19, 1889 | R. Eickemeyer | Hat-pouncing machine | ||
| 1,854,071 | Apr. 12, 1932 | E.C. Schacht | Method of manufacturing abrasives | ||