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| Patents for Charles M. Letz | |||||
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| Number | Date | Patentee | Title | Type | |
| 267,353 | Nov. 14, 1882 | C.M. Letz | Machine for Notching and Trimming Electotypes | printer | |
| 336,814 | Feb. 23, 1886 | C.M. Letz | Machine-table gage | dovetailing machines | |