A retracting tether apparatus is disclosed comprising a retractor housing having a locking post on its outside surface. The apparatus also includes an attachment mechanism, such as a belt clip, for attaching to a body and a retaining section, the attachment mechanism being integral to the retaining section....http://www.google.com.tw/patents/US6966519?utm_source=gb-gplus-share專利 US6966519 - Rotatable retracting apparatus
