| http://www.w3.org/ns/prov#value | - In this embodiment, a device having at least two sealed chambers in tandem is utilized and two of the chambers contain a liquid crystal layer which layer is a nematic material having a positive dielectric anisotropy and a homogeneous orientation with the molecules of the layer being twisted in a direction perpendicular to the plane of the surface to form a pair of rotational cells with the angle o
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