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| All Patents in class 315/289 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,155,500 | Oct. 05, 1915 | T.C. Menges | Coördinating Actuating Means for Magnetos and Igniters of Internal Combustion Engines | |
| 3,206,639 | Sep. 14, 1965 | R.L. Henry | Electrical Discharge Machining Apparatus | ||