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| All Patents in class 277/445 | |||||
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| Number | Date | Patentee | Title | Type | |
| 407,370 | Jul. 23, 1889 | E.F. Peacock | Piston Packing | piston ring and packing | |
| 627,707 | Jun. 27, 1899 | J. Price | Piston | pump pistons | |