| http://www.w3.org/ns/prov#value | - Transparent sheets that may be employed in conjunction with the invention are formed from materials such as quartz, sapphire, diamond and fused silica, or from polymeric materials such as polystyrene and styrene-butadiene copolymer. ???Optically transparent??? refers to a material capable of transmitting light of wavelengths in the range of about 150 nm to 800 nm.
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