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| All Patents in class 277/488 | |||||
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| Number | Date | Patentee | Title | Type | |
| 159,675 | Feb. 09, 1875 | J.W. Hill | Improvement in piston-packings | piston ring and packing | |
| 693,777 | Feb. 18, 1902 | E. Berry | Steam or Other Piston | steam engine pistons | |