| http://www.w3.org/ns/prov#value | - Slit II opens and as the pressure in the springs continues, the opening passes from an elliptical stage to one in which the opening is substantially a circle as shown in Figure 3, thus providing an opening for inserting or withdrawing articles such as key H. In this position, members 8 and 9 form a reinforcing perimeter to open the slit and keep it substantially circular.
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