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| All Patents in class 74/557 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 20,711 | Jun. 29, 1858 | T.R. Hopkins | Ring Clamp for Engravers | |
| 1,570,251 | Jan. 19, 1926 | F.O. Hoagland | Collet and collet mechanism | ||
| 2,086,722 | Jul. 13, 1937 | C.J. Matuella | Valve Turning Tool | ||