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| All Patents in class 313/48 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 626,352 | Jun. 06, 1899 | G.W. De Tunzelmann | Apparatus for Holding Carbons for Electric Welding | ||
| 1,425,440 | Aug. 08, 1922 | R.F. Morgan, W.C. Beiswinger | Electrode Holder | ||