New means are providedfor securing the free end of a roll of photographic film against unwinding. The means comprises a strip of flexible plastic which clings to the photographic film, at the free end of the roll and also on the body of the roll adjacent the free end....http://www.google.com.tw/patents/US4276371?utm_source=gb-gplus-share專利 US4276371 - Roll fastener for photographic film
