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| Patents for Charles Stengel | |||||
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| Number | Date | Patentee | Title | Type | |
| 183,030 | Oct. 10, 1876 | C. Stengel | Improvement in machines for forming dovetail-joints in wood-working | dovetailing machines | |
| 199,117 | Jan. 08, 1878 | C. Stengel | Improvement in dovetailing-machines | dovetailing machines | |
| 211,531 | Jan. 21, 1879 | C. Stengel | Improvement in dovetailing-machines | dovetailing machines | |