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| Patents Granted on 1866-03-20 | |||||
| Number | Date | Patentee | Title | Type | |
| 53,265 | Mar. 20, 1866 | J. Braun | Improvement in looms | ||
| 53,289 | Mar. 20, 1866 | G.B. Fowler | Improvement in wood-splitters | wood splitting machines | |
| 53,374 | Mar. 20, 1866 | A. Hatch | Improvement in Lathes | metal lathe accessories and attachments | |
| 53,382 | Mar. 20, 1866 | H.C. Sisco | Improvement in lathes for turning wagon-hubs | wood lathes | |