| http://www.w3.org/ns/prov#value | - The inner opaque band 80 is interrupted by a single transparent sector 88 which extends radially in line with a transparent sector 86A but is disposed so that one edge thereof coincides with the boundary between the transparent sector 86A and an adjacent opaque sector 84A. In practice the discs 22 and 28 are manufactured by preparing a drawing of the desired pattern, e.g. the pattern shown in FIG.
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