Apparatus use in a vehicle used for multiple business purposes or for business and personal use allows one to record and display mileage for each type of use. Employing a plurality of selectable memory banks each dedicated to a designated business or personal activity, the apparatus allows a user to...http://www.google.fr/patents/US5267159?utm_source=gb-gplus-shareBrevet US5267159 - Mileage recording and display apparatus
