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| Patents for Wilhelm Dralle | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,024,577 | Mar. 13, 1962 | W. Dralle, S.G. Brady | Helical Gear or Spline Grinder | ||
| 3,038,280 | Jun. 12, 1962 | W. Dralle | Internal Stock Divider | ||
| 3,277,613 | Oct. 11, 1966 | W. Dralle, S.G. Brady | Grinding Method | ||