| http://www.w3.org/ns/prov#value | - Subsequent to dropping or releasing marker 150, projecting pins 190 and 192 of slide bars 152 and 154 respectively, a re contacted by bar 177 and slide bars 152 and 154 are returned to their resting position, as shown in FIG. 7A. Bar 177 can be attached to push bar 156 by known means such as screws, or it can be integral with the push bar.
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