| http://www.w3.org/ns/prov#value | - In a method in accordance with the invention for calibrating, verifying or validating an instrument or implant (also referred to below as the instrument) which can preferably be used medically and to which at least one marker (and preferably three markers, for example in the form of a so-called reference star, or a number of markers having a geometry which is known, fixed or for example variable d
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