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| Patents for R. M. Barr | |||||
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| Picture | Number | Date | Patentee | Title | |
| 188,880 | Mar. 27, 1877 | W.H. Ewing | Improvement in machines for setting up barrels | ||
 | 189,453 | Apr. 10, 1877 | G. Gocher | Grooved Cutter for Bead Planes | |