| http://www.w3.org/ns/prov#value | - The prestressing element preferably has two essentially strip-shaped retaining parts that are kept spaced apart from each other and two collars that are supported in rotary fashion between the retaining parts and are affixed to the connecting rods; at least the strip-shaped retaining parts are composed of a rigid material, in particular a rigid plastic material, e.g. a fiber-reinforced thermoplast
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