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This mechanism has been patented by August Keller from Dearborn, Michigan USA in Jan. 1939. The system has nine linkages and thirteen revolute joints in the plane and therefore, one degree of freedom.
Image: Collapsible top US Patent No. US00000221322
| Date | : | 15.04.2013 |
| Location | : | Rheinisch-Westfälische Technische Hochschule Aachen, Germany |
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