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| All Patents in class 74/557 | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,711 | Jun. 29, 1858 | T.R. Hopkins | Ring Clamp for Engravers | ||
| 2,086,722 | Jul. 13, 1937 | C.J. Matuella | Valve Turning Tool | valve turning tools | |