This invention relates to a device which is either permanently attached or removable to the edge of a material such as a vehicular glass window. This device may be comprised of a converter sub-unit (vibrator) and an amplifying coupler. These elements are arranged so as to propagate mechanical motion...http://www.google.fr/patents/US7084553?utm_source=gb-gplus-shareBrevet US7084553 - Vibrating debris remover
