In bar code symbol scanning systems employing laser, optical and sensor components a superstructure mounted on a housing and having a movable exit port to adapt the housing to steer a laser beam through the exit port to a particular course. Both right and left handed users are thereby accommodated....http://www.google.de/patents/US5306900?utm_source=gb-gplus-sharePatent US5306900 - Hand held bar code scanner with adjustment of direction of emitted light beam
