A container made from a hard synthetic resin is provided on a key body (12). A container half (26) and the other container half (27) of the container (16) are attached to a key body (12) and a transmitting element (18) is secured to the container halves (26) and (27) in a sealed condition. A soft resin...http://www.google.fr/patents/US6164101?utm_source=gb-gplus-shareBrevet US6164101 - Key with built-in transmitting element
