| http://www.w3.org/ns/prov#value | - In one instance, the communication unit 508 can alert retail personnel that a device's door assembly 218 has been opened by making an announcement over the store's public address (???PA???) system or interrupting music playing over the store's PA system with a beep, ping, or other sound that lets store personnel know that an access door has been opened and that product is being vended.
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