| http://www.w3.org/ns/prov#value | - Accordingly, with reference to FIG. 25, like reference numerals will refer to like features previously described with the foregoing drawings. [0102] In general, the distance detector 60 depicted in FIG. 25 is provided with a transmitter 61 that transmits a sonic, desirably an ultrasonic beam or a visible, particularly a laser beam, towards the second surface 70.
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