| http://www.w3.org/ns/prov#value | - As an example of a means for biasing the wick 50 against the coil 12 and with the understanding that alternative forms of devices may be used, there is shown in FIG. 6 a backing plate 52 adjacent the rear side of the wick 50 and a spring 54 disposed under compression between the backing plate 52 and the rear wall 15.
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