| http://www.w3.org/ns/prov#value | - e communication as required. [0182] The ICE unit 50 is configured to transmit data back to the readers, providing information such as feedback on its own functionality, status or audit trail information. [0183] Crucially, the ability of the ICE unit 50 to transmit data back to the readers allows the protection apparatus to control access to a cassette without the use of mechanical locks.
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