| http://www.w3.org/ns/prov#value | - a plurality of lenses arranged in a line and each having a convex lens surface; a transparent holder formed integral with the lenses and having a flat surface from which the convex lens surface project, the holder also including grooves extending from the flat surface into a wall thickness of the holder for optically separating the lenses from each other; and light shielding means covering the fla
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