Here is a high-power hydraulic artificial muscle designed for tough robots that can be run over by a car and still continue performing. Tokyo Tech and Bridgestone developed this 15mm diameter muscle that generates 700 kgf of contraction force. The force is adjustable. As you can see in this video, these robots can be used to handle tools and even crush concrete.
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High-Power Hydraulic Artificial Muscle for Tough Robots
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