| 摘要 |
<p>A security system for securing an article, shown in the form of a key, against unauthorized removal, the system including a threaded fastener having a driving surface enveloped by a free-spinning collar and a tool for engaging the collar for rotation while frictionally coupling the collar with the threaded fastener to enable rotation of the fastener with the collar and removal of the article only by the authorized person in possession of the tool.</p> |
