An automatic car tire pressure detecting apparatus constitutes an emission means located at the wheel rim of the tire and a receiving means located at the brake pad. The emission means includes a generator, an emission end and a pressure sensor. The generator has a coil which has a positive and a negative...http://www.google.fr/patents/US20020134150?utm_source=gb-gplus-shareBrevet US20020134150 - Automatic car tire pressure detecting apparatus
