| http://www.w3.org/ns/prov#value | - In apreferred embodiment of the invention, the frame element is overmolded to the peripheral region of each piston.For reasons that will be explained hereinafter, the first material, of which the piston or pistons are made, is a material that has a greater or higher stiffness, rigidity, tensile strength, or hardness, than the second material.
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