The present invention relates to a card having magnetic sheet secured to one surface and having a ramp to facilitate mailing. The ramp helps mail properly pass through high speed postal sorting equipment, for example, so as to prevent the edge of a magnetic strip on one card from interfering with...http://www.google.es/patents/US5676307?utm_source=gb-gplus-sharePatente US5676307 - Card having magnetic sheet secured to one surface and having a ramp to facilitate mailing
Card having magnetic sheet secured to one surface and having a ramp to ...
