| http://www.w3.org/ns/prov#value | - It is within the scope of this invention to employ one or more springs or other yieldable urging members or mechanisms positioned between the sensors and urging them outwardly, e.g. but not limited to the optional hollow bar 88, spring 89 arrangement shown in FIG. 3 in which the spring 89 urges both detectors 31N, 41N outwardly.
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