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![1: The PowerMate by Griffin Technologies was used as the knob like device. | Download Scientific Diagram 1: The PowerMate by Griffin Technologies was used as the knob like device. | Download Scientific Diagram](https://www.researchgate.net/publication/39066030/figure/fig12/AS:497527297449985@1495631159696/The-PowerMate-by-Griffin-Technologies-was-used-as-the-knob-like-device.png)