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| Patents for Charles Drewes | |||||
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| Number | Date | Patentee | Title | Type | |
| 264,412 | Sep. 12, 1882 | H.F. Kuhlmann | Saw-guard | woodworking machine safety guards | |
| 281,274 | Jul. 17, 1883 | H.F. Kuhlmann | Saw-guard | woodworking machine safety guards | |