| http://www.w3.org/ns/prov#value | - One or more light transmitting elements, such as a plurality of light transmitting fibers 26, extend longitudinally through the tubular member 19 and are disposed in the space between an inner surface of tubular member 19 and the channels 24A, 24B and 24C. In the case of barrel 12, the channels 24A 24B and 24C are formed by thin wall, hollow cylindrical or tubular sleeves 28A, 28B and 28C, respect
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