| http://www.w3.org/ns/prov#value | - A plurality of light pipes or fiber optic bundles, denoted 46 and 47, respectively conduct light, such as laser light, froma source of such light to the end 48 of the assembly of light pipes and receive such light after it has passed throug hfluid or liquid in the cavity 37 for conducting same back along the light pipe 47 to a photoelectric detector.
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