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| All Patents in class 74/518 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,922,202 | Aug. 15, 1933 | E.A. Hall, W.E. Heuer | Cylinder Working Tool | ||
 | 2,410,889 | Nov. 12, 1946 | R. Martines | Tool | |
 | 2,448,245 | Aug. 31, 1948 | H.F. Bakewell | Grinding fixture | |