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| All Patents in class 219/153 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 458,115 | Aug. 18, 1891 | E. Thomson | Method of Electric Bending and Straightening | ||
| 2,903,569 | Sep. 08, 1959 | J.M. Davis, G.H. Hochmuth | Method of Forming Spiral Blades | ||
| 2,958,753 | Nov. 01, 1960 | G.H. Hochmuth, J.M. Davis | Die Set for Forming Cutter Blades | ||