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| All Patents in class 219/128 | |||||
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| Number | Date | Patentee | Title | Type | |
| 434,530 | Aug. 19, 1890 | E. Thomson | Process of and Apparatus for Forming and Welding Metals by Electricity | welding apparatus | |
| 2,372,605 | Mar. 27, 1945 | W.F. Ross | Method and Apparatus for Making Solid Objects From Metal Powder | powdered metal apparatus | |