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| All Patents in class 219/57 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 434,530 | Aug. 19, 1890 | E. Thomson | Process of and Apparatus for Forming and Welding Metals by Electricity | ||
 | 435,283 | Aug. 26, 1890 | C.L. Coffin | Method of and Apparatus for Welding by Electricity | |