A reader comprises a feeding path for boarding pass to be inserted in various orientations, pairs of feeding rollers for transporting the boarding pass along the path, and four sensor units arranged along the path each for sensing a signal recorded on the boarding pass inserted in a particular orientation....http://www.google.com.tw/patents/US5291005?utm_source=gb-gplus-share專利 US5291005 - Apparatus for reading a magnetic stripe on a boarding pass regardless of the orientation of the boarding pass
