| http://www.w3.org/ns/prov#value | - The distal end of the rod 124 is provided with two jaws 126 and 128, whose inner diametrically opposite straight working surfaces 130 and 132 are suitably designed and spaced one from the other a suitable distance so that they can be applied from the outside upon the corresponding edges 54 and 56 (see especially FIG. 2) of the button 40.
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