| 摘要 |
A combination of a sign and a support therefore for attachment to an object, one or both of the sign and support comprising signal generation means and an antenna for receiving and/or broadcasting information, say information about the object, to a location remote from the sign or object, said signal generation means having a first state and a second state, a circuit in operable communication with the signal generation means such that, in use, when the sign or support is attached to the object, the circuit is such that said signal generation means operates or is able to operate in the first state, whereupon removal or partial removal of the sign or support from the object the circuit is such that said signal generation means operates or is able to operate in the second state. |
