This device is unique, in that it employs an aromatic scent in a sponge, for attracting animals. It consists primarily of the sponge, that is impregnated with a few drops of deer lure or other lure, and it includes a plastic housing that is provided with a spring clip, for attaching it to any desired...http://www.google.co.uk/patents/US4302899?utm_source=gb-gplus-sharePatent US4302899 - Hunters and trappers scent pad
