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| Patents for Charles F. Barter | |||||
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| Number | Date | Patentee | Title | Type | |
| 413,316 | Oct. 22, 1889 | W.J. Dobson | Counterbore Auger Attachment | drill accessories | |
| 431,568 | Jul. 08, 1890 | H. Esser | Measuring-Scale | rule graduations | |
| 431,719 | Jul. 08, 1890 | A.H. George | Hand Screw | clamps | |