le paint for temporary markings on terrain and structures such as signs, roadways, trees, and buildings,...http://www.google.es/patents/US6066439?utm_source=gb-gplus-sharePatente US6066439 - Instrument for photoerasable marking B???squeda avanzada de patentes N???mero de publicaci???nUS6066439 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 09/204,774 Fecha de publicaci???n23 May 2000 Fe