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| All Patents in class 219/155 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 453,162 | May 26, 1891 | E.E. Ries | Apparatus for Hardening and Tempering Steel and Iron | ||
| 458,115 | Aug. 18, 1891 | E. Thomson | Method of Electric Bending and Straightening | ||