| http://www.w3.org/ns/prov#value | - However, because the above proposal by Stamm provides a specular layer on reflective lateral faces as a means to improve wide angularity, such drawbacks as that appearance of the formed retroreflective sheeting and retroreflector is apt to become dark, or the metal used for the specular layer such as aluminum or silver is oxidized during use by infiltrated water or air, which leads to occasional d
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