| http://www.w3.org/ns/prov#value | - The reflecting layer 16 and the dielectric tuning layer 22 serve :to enhance wave' trapping so that energy which has entered 2,875,435 Patented l 'eh. 24, 195-9 ice ' the reflecting layer 16 may be made of materials such as sheet metal, aluminum foil and wire screen if reflecting layer 16 is 'to be opaque.
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