| http://www.w3.org/ns/prov#value | - Transparent plate 590 may be made of a synthetic material such as silicone, polymethylmethacrylate, hydrogel, polysulfone, glass, or any other suitable material, can have an outer diameter of, for example, about 1 mm to about 12 mm, or any other suitable diameter, and can be circular, square, rectangular or any other suitable shape.
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