| http://www.w3.org/ns/prov#value | - The invention also contemplates the provision of means to engage a curved surface for establishing a dimension associated with a circle, as for example a diameter D, or radius R. Referring to FIG. 4, such means typically defines two reference probes 90 and 91 projecting in generally the same direction, as from a support 92 to which those probes are fixed.
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