A wheel-state obtaining apparatus including wheel-side devices each operable to transmit wheel-side information in response to an abrupt change of a tire air pressure of a corresponding one of wheels, when the tire air pressures of the wheels are abruptly changed in a predetermined order by an operator...http://www.google.fr/patents/US7262688?utm_source=gb-gplus-shareBrevet US7262688 - Wheel-state obtaining apparatus, and wheel-position-information obtaining method
Wheel-state obtaining apparatus, and wheel-position-information obtaining method
