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| All Patents in class 219/68 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 416,873 | Dec. 10, 1889 | B.C. Tilghman | Cutting Metals by Electricity | ||
| 3,109,915 | Nov. 05, 1963 | W. Pentland, J.L. Wennberg | Method of and Apparatus for Machining Work at Elevated Temperature | ||
| 3,862,391 | Jan. 21, 1975 | O.C. Blomgren, Jr., O.C. Blomgren, Sr. | Method And Apparatus For Removing Material form a Workpiece | ||