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| All Patents in class 277/446 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,146 | Feb. 27, 1849 | W. Wright | Metallic Packing for Pistons | ||
| 693,777 | Feb. 18, 1902 | E. Berry | Steam or Other Piston | steam engine pistons | |