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| All Patents in class 27/31 | |||||
| Number | Date | Patentee | Title | Type | |
| 455,466 | Jul. 07, 1891 | J.R. Back | Rest for metal-turning lathes | metal lathes | |
| 465,548 | Dec. 22, 1891 | W.H. White | Annunciator for the Supposed Dead | ||