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| Patents for F. E. Kellner | |||||
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| Number | Date | Patentee | Title | Type | |
| 489,413 | Jan. 03, 1893 | J.E. Duncan | Folding Try Square | try squares | |
| 547,540 | Oct. 08, 1895 | J.E. Duncan | Try and Bevel Square | try squares | |