| http://www.w3.org/ns/prov#value | - More specifically, each fastener 151 extends through one of the fastener blocks 125 and into the door 2 or doorway and has a head 153 that is engageable by a tool, such as a screw driver, an Allen wrench, etc. (none shown), each barrier 152 being configured to prevent engagement of the tool with the head 153 of the proximal fastener 151 when the barrier 152 is located in the first position B1.
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