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| Patents for Robert S. Hahn | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,874,809 | Apr. 01, 1975 | R.S. Hahn | Apparatus for Machining Surface of Revolution Having Discontinuites | |
| 3,913,277 | Oct. 21, 1975 | R.P. Lindsay, R.S. Hahn | Grinding Machine | ||