A data carrier system is comprised of a vehicle-side controller 12 mounted at a vehicle 11, keys 19A and 19B, and an R/W device 31 installed in an office 29. A transponder 20 is built into each of the keys 19A and 19B. In this structure, after operational data has been transmitted from the vehicle-side...http://www.google.fr/patents/US6269292?utm_source=gb-gplus-shareBrevet US6269292 - Data carrier system
