Compact, high weight to force air powered "muscles" for robotics and 
many other applications. Extremely simple principle - easily 
replicated.

        http://www.shadow.org.uk/products/airmuscles.shtml

Not quite as good as they make out though. Their less than precise 
force/action locus makes them more like a human muscle than eg a 
pneumatic cylinder is. Still extremely useful though.


        RM
 

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