| http://www.w3.org/ns/prov#value | - If the device 20 has the polarizers 13 and 13' and both of its chambers 9 and 10 contain rotation cells which have an amount of rotation of a different angle, for example 90??? and 45???, respectively, and if the carrier foil 5 is of a birefringent material such as mica at least four different colors can be created by selective operation of the cells.
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