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| All Patents in class 277/470 | |||||
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| Number | Date | Patentee | Title | Type | |
| 225,555 | Mar. 16, 1880 | E.M. Birdsall | Piston for Steam Engines | steam engines | |
| 238,935 | Mar. 15, 1881 | W.J. Liddell | Piston-packing | piston ring and packing | |