A double-reading preventive control processing unit, when demodulated data corresponding to a whole bar code is obtained in an M10-OK buffer, notifies a reading-OK processing unit of this demodulated data on condition that a double-reading preventive timer is not actuated, stores a single-reading multi-stage...http://www.google.com/patents/US6206286?utm_source=gb-gplus-sharePatent US6206286 - Bar code reader
