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| All Patents in class 219/123 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 561,367 | Jun. 02, 1896 | G.L. Badger | Method and Apparatus for Dressing Stone | ||
 | 775,282 | Nov. 15, 1904 | R. Raddatz | Electric furnace | |
| 1,604,180 | Oct. 26, 1926 | J.F. Lincoln | Arc Welding | ||