A system utilizing a cellular mobile radiotelephone and the public switching telecommunication network (PSTN) for entering into rental agreements and for accruing and billing the resulting rental charges associated with the rental of equipment, such as automobiles. The automobiles to be rented incorporate...http://www.google.de/patents/US4965821?utm_source=gb-gplus-sharePatent US4965821 - Cellular mobile radiotelephone-based system for rental of mobile equipment
