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| Patents for Don Heyer | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,023,421 | Dec. 10, 1935 | D. Heyer | Flexible power transmission device | industrial machine pulleys and belt drive mechanisms | |
| 2,256,114 | Sep. 16, 1941 | D. Heyer | Variable speed drive with multiple belts | industrial machine pulleys and belt drive mechanisms | |