| http://www.w3.org/ns/prov#value | - e mounted such that the disc is suspended above the surface of the first panel; and a retainer ring having an upper surface, suspended from the second panel, adapted to engage the enclosure so that there is a space between the upper surface of the retainer ring and the second panel, adapted to fit over the boss when the panels are closed together to retain the disc on the hub, spaced from the surf
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