| http://www.w3.org/ns/prov#value | - The configuration ofFIG. 12, however, adds a further motion to the assembly for supporting a housing such as 14 in FIG. 2, permitting the pads supported thereby to be disposed in substantially flat contact with the concave surface being ground or polished.The arrangement in FIG. 12 has a large, circular, highly concave optical piece 200 whose upper surface is to be ground and polished to have a co
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