| http://www.w3.org/ns/prov#value | - With reference to FIG. 9, in a particularly preferred embodiment, electrodes 56 line an inner surface of the cavity 54 of the track 50 which contact electrodes 58 of the protuberance 48 in order to transmit power from the power supply 18 to the LED's 22 of the lighting unit 20.
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