| http://www.w3.org/ns/prov#value | - In some embodiments a plurality of axisymmetric electro-pneumatic elements may be used which form a stack and which is held in position by a plurality of rods on or close to the circumference of the electro-pneumatic elements such that the position as well as the distance between the electro-pneumatic elements on the rods is determined (and can be changed) by a plurality of spacers, small tubes, o
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