| http://www.w3.org/ns/prov#value | - Or it may be a concave bowl-form whose parabolic plane is partly worked (a part of normal concave mirror is used instead of transparent member). [0981] If the reflection plane is formed with the metal thin film such as Al, it should be coated by UV resin or with SiO2 and magnesium fluoride. [0982] The reflection plane 1793 may be formed with metal thin film and reflection sheet and metal plate may
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