| http://www.w3.org/ns/prov#value | - In still another type of improved, variable reflectance mirror according to the invention, which is illustrated by mirror 400 of FIG. 4, the reflecting means is a layer, 20, of highly reflective material, such as silver, adhered, by any standard technique in the mirror-fabricating art, to surface 131 of the device of reversibly variable transmittance so that a high fraction, preferably at least ab
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